Neither good, nor bad. Tropes just are.
What Are Ya Buyin’- A way of Displacement, and easily the most widely used. This trope involves the Displaced before their Displacement attending a convention, usually dressed as their character, and buying an item from The Merchant, usually a vital piece of their cosplay that they couldn’t find anywhere else. They are then immediately dumped into the void, often blacking out and waking up in Equestria.
Rescue from Doom- A method of Displacement, most often used for so called Power Lotto- Displaced. It involves the previous universe getting destroyed, and an outside force to intervene, and displace them. They tend to be placed in a specific Equestria, not just one random from millions.
Outside-Context Villain / Hero- When a Displaced has their first crossover, summoning or meeting another Displaced for the first time.
Stoned- Most overdone and common means of imprisoning villainous (and sometimes heroic) Displaced. 1000 years in the past, when the Displaced first arrived, they were transformed into stone by Celestia and Luna, and the Elements of Harmony. They awake in the modern timeline, usually soon after or literally minutes behind Discord’s escape. This trope became popular due to its use in the elder Displaced stories, from before the group existed.
Ain’t No Mountain High Enough- Generally considered a negative aspect of any story, this trope involves the main Displaced character being completely overpowered. Usually means that nothing in the whole of the setting poses a significant threat to them and they have no exploitable weaknesses whatsoever.
Cookie Cutting- The means through which a Displaced is displaced varies little and the person displacing them varies even less. This is a the trope in which someone is Displaced via The Merchant. This trope usually goes hand-in-hand with What Are Ya Buyin’.
Golden Bastard- A Displaced character or human with an undeniable amount of power. They are easily detestable, undeniably "in the right", and tend to hold little regard for other characters, whether intentionally or unconsciously. These characters tend to have powers that, even before mastered, are incredibly strong and, once mastered, are ridiculously strong. Also tends to contain Ain't No Mountain High Enough and these characters can be considered Gary Stu/Mary Sue.
Fuck Everything and Everyone- The Displaced has a harem. This harem usually includes a substantial number of canon characters.
We’re All Mammals - There are no issues with the concept of interspecies romantic or sexual relationships.
Loki’s Revenge- The character in question, in this case referring to a Displaced, claims to be a god.
Can’t Touch This- also called Hit Me With Your Best Shot. In which any attempts to attack or harm a Displaced are transitory or fail to be carried out. Usually goes hand in hand with Ain’t No Mountain High Enough.
There Are No Therapists in the Omniverse - The Displaced has mental issues and instabilities that are never resolved, treated, or even talked about.
Special Snowflake- There Are No Therapists in the Omniverse, Can’t Touch This, and Ain’t No Mountain High Enough meet in a spectacularly cringe-worthy merger of Sue proportions. Can also include Fuck Everything and Everyone.
This Is A Public Library- The Displaced ends up invariably shacking up with Twilight Sparkle in the Golden Oaks Library, or post-Tirek the Castle of Friendship.
Remember the New Prince(ss)? - Through marriage, adoption, or siblinghood, the Displaced is related to the Princesses of Equestria and thus has a royal title.
The Chosen- For some reason, the Displaced is the only one that can do anything to the antagonist at all, including the antagonist’s underlings. The ponies are left to depend on the Displaced, even though they have been shown to be perfectly able to fight back using the Elements of Harmony. This tends to go along with Ain’t No Mountain High Enough.
I’d Like to Be A Tree - The Displaced first enters Equestria in the Everfree.
I’ll Be Back, Baby - The Displaced has a grudge or wants revenge on the Princesses. Goes hand in hand with Stoned on occasion.
You CAN Thwart Stage One - In which the Displaced uses their knowledge of canon in order to head off villains of the week/season finale off at the pass.
I’m King O’ The World- The Displaced wants to rule Equestria, the World, the Universe, or anything in general. Can be accompanied by Diplomatic Immunity Ain’t For Me.
Ultimate Irony - The Displaced in question is a sociopath. Tends to be more effective (read: ironic) if the Displaced is The Chosen.
What Is It Good For? - The Displaced gets involved with or even starts a war. This can be as little as a conflict contained between two countries in their adopted universe or extend up to and include levels of the Wars.
TWAS I- The Displaced has some sort of involvement, usually villainous, with past tragedies or events, such as Nightmare Moon or Discord.
Diplomatic Immunity Ain’t For Me - The Displaced can violate laws and other legal requirements of Equestria without getting into any trouble.
Pleasure Dome - The Displaced story is only used as literal wank material.
We’re All Friends Here, M80 - The Displaced becomes or is friends with the Elements, Discord, the Princesses or so on so forth. Could include TWAS I.
Sub-Trope:
I’ve Got Friends On the Other Side - The Displaced was friends with Discord before he was reformed.
Eskimo’s Are A Pony’s Best Friend - The Displaced ends up in the Crystal Empire, or the Frozen North, in the beginning of the story.
I am the Prettiest Pony Princess in All the Land - The Displaced saves Equestria, or otherwise, and is rewarded in one form or another. Most notably this includes getting the Crystal Heart, beating Sombra, or beating Tirek.
Flyswatters Aren’t For Kids - The Displaced beats Chrysalis, enslaves the changelings, rules the changelings, or some variation thereof.
Off With Their Heads - The Displaced kills off a canon character(s).
These Boots Were Made For Walkin’ - The Displacer, most notably the Merchant, allegedly has some master plans and it is referenced as such in the story.
And That’s Just What They’ll Do - The Displaced agrees with or follows through with someone else’s plans, typically not giving a reason.
We’re Roomies! - The universe contains multiple Displaced.
This is YOUR side - One of the Displaced is beloved by ponies and the other is hated. Typically a hero-villain relationship.
The Laundry Room is Down the Hall - The Displaced start living together.
OH HO, OH No You Didn’t - The Displaced overreactions to a very normal and calm situation.
Oh Yes I Did - An argument of morality and ethics starts, between Displaced and pony, for no clear reason.
This is MAH Kingdom - Celestia is a paranoid xenophobe.
I’m in love with the cocoa - The Displaced quickly and easily adapts to Equestria and their situation for no reason.
Damn it Harvey - The Displaced is insane, usually for no given reason.
I’m Really Digging These Threads - The Displaced wears ONLY their cosplay costume and the clothes, never changes.
Um… Who Dis Be? - The Displaced has amnesia.
Thas Not My Name - The Displaced no longer uses their human/given name.
One MILLION Bits - Money is no issue for the Displaced.
Lady Luck Weighted the Dice - The Displaced is absurdly lucky.
Funded By Trump - The antagonizining force is non-human and non-pony
I am the Bible - Also could be called The Messiah Syndrome, the Displaced claims to be better, stronger, and smarter than the ponies.
By the Power of Grayskull - The antagonist is a Void Dweller.
Long Live SCIENCE - The protagonist denies the existence of magic.
Your Whole Life is a Lie - Magic is a kind of science.
Burn the Heretic - The protagonist argues, and possibly proves, the Diarches do not raise the sun and moon.
The Student Is The Master - The Displaced learns everything at an incredible rate, mastering things at a ridiculous rate, or already knows how to use all of their abilities.
Let's Go Fishing - The ponies eat something entirely unexpected, such as fish or meats.
Pandora's Box - The Displaced is the source of trouble, pain, etc for the ponies and Equestria.
Genocide Run - The Displaced wants to kill anything and everything for some reason.
I Am The Animu - The protagonist is constantly sought after by the ponies and typically remains blissfully unaware of said fact.
Tsundere Sharks - The pony, or ponies, are out of character in a romantic relationship. Can partner with Fuck Everything and Everyone as well as I Am the Animu.
All That And A Bag Of Chips - Any, and all, canon characters are extremely out of character.
Just Having a Bad Day - Something goes incredibly and crazily wrong, but, as soon as the Displaced gets involved, or the next time it happens, the situation is fixed somehow.
That Time Of The Month - also called Kat's Had A Bad Day. The characters are super emotional.
2Spoopy4Me - The Displaced runs away while music plays, typically in the form of a hyperlink or a Youtube Video.
They Sprinkled Crack On My Cereal - The story focuses primarily on what the author deems important, emphasizing these parts to the extreme, while glossing over the main details of the story.
I'm Just A Teenage Dirtbag Baby - The Displaced despises and hates all other Displaced.
Find You've Got The Music - The Displaced's displacer is Essence.
Happenstance, Smappenstance - The Displaced, upon being summoned, complains about having been doing something important.
I Took the Road MOST Travelled By - The Displaced summons another Displaced to assist them out of a situation.
Don't Use Bing, Google It - The Displaced uses simple and idiotic ideas to justify their actions.
I'll Get the Popcorn - The Displaced watches Discord get imprisoned and doesn't interfere, either time.
I Know You Are, But What Am I - The Displaced gets in a fight without whoever summoned them over a trivial and simple issue.
Nobody Expects The Spanish Inquisition - The Displaced easily defeats the princesses or main six.
Daddy/Mommy Dearest - The Displaced adopts Scootaloo or another canon foal.
Where Art Thou Johnny - The Displaced loses something important upon their Displacement and tries to get it back.
I'm Sorry, Wilson! - The Displaced's family, adopted or otherwise, is subjected to some tragic events, possibly even dies.
Do You Even Lift Bro? - The Displaced flaunts their power or beats a canon character with ease.
Faster. Better. Stronger. EVERY TIME - The Displaced comes back from a defeat and kicks the antagonists arse with extreme ease.
Can't Believe My Eyes - The story in question describes things with pictures and interjects with a youtube video at some point.
Hitler Did Nothing Wrong - The Displaced is instantly hated by the ponies, whether world-wide or just small groups, the instant they enter Equestria.
And... Scene! -The Displaced faints/blacks out before ending up in Equestria.
Frozen Brain Surgery - The Displaced experiences headaches when arriving Equestria, and they have no explanation, usually.
My Name is Leroy Jenkins and Welcome to Jackass - The Displaced shows an overarching tendency to rush into things without a plan or an idea in general.
Wow, that went fifty feet Harry! - The Displaced does something that's considered impressive by the ponies or the author. Usually something considered powerful.
I AM LORD SHEN - The Displaced has a pissing contest with someone, literally could be anyone, or something, literally could be a pebble named Joe that he found on the bend of the river.
Meet Bella Swan - When two characters, namely a Displaced and a pony, get together for some reason and it just works because MAGIC.
Dash of Pride - Gay instance of Meet Bella Swan.
What Are Ya Buyin’- A way of Displacement, and easily the most widely used. This trope involves the Displaced before their Displacement attending a convention, usually dressed as their character, and buying an item from The Merchant, usually a vital piece of their cosplay that they couldn’t find anywhere else. They are then immediately dumped into the void, often blacking out and waking up in Equestria.
Rescue from Doom- A method of Displacement, most often used for so called Power Lotto- Displaced. It involves the previous universe getting destroyed, and an outside force to intervene, and displace them. They tend to be placed in a specific Equestria, not just one random from millions.
Outside-Context Villain / Hero- When a Displaced has their first crossover, summoning or meeting another Displaced for the first time.
Stoned- Most overdone and common means of imprisoning villainous (and sometimes heroic) Displaced. 1000 years in the past, when the Displaced first arrived, they were transformed into stone by Celestia and Luna, and the Elements of Harmony. They awake in the modern timeline, usually soon after or literally minutes behind Discord’s escape. This trope became popular due to its use in the elder Displaced stories, from before the group existed.
Ain’t No Mountain High Enough- Generally considered a negative aspect of any story, this trope involves the main Displaced character being completely overpowered. Usually means that nothing in the whole of the setting poses a significant threat to them and they have no exploitable weaknesses whatsoever.
Cookie Cutting- The means through which a Displaced is displaced varies little and the person displacing them varies even less. This is a the trope in which someone is Displaced via The Merchant. This trope usually goes hand-in-hand with What Are Ya Buyin’.
Golden Bastard- A Displaced character or human with an undeniable amount of power. They are easily detestable, undeniably "in the right", and tend to hold little regard for other characters, whether intentionally or unconsciously. These characters tend to have powers that, even before mastered, are incredibly strong and, once mastered, are ridiculously strong. Also tends to contain Ain't No Mountain High Enough and these characters can be considered Gary Stu/Mary Sue.
Fuck Everything and Everyone- The Displaced has a harem. This harem usually includes a substantial number of canon characters.
We’re All Mammals - There are no issues with the concept of interspecies romantic or sexual relationships.
Loki’s Revenge- The character in question, in this case referring to a Displaced, claims to be a god.
Can’t Touch This- also called Hit Me With Your Best Shot. In which any attempts to attack or harm a Displaced are transitory or fail to be carried out. Usually goes hand in hand with Ain’t No Mountain High Enough.
There Are No Therapists in the Omniverse - The Displaced has mental issues and instabilities that are never resolved, treated, or even talked about.
Special Snowflake- There Are No Therapists in the Omniverse, Can’t Touch This, and Ain’t No Mountain High Enough meet in a spectacularly cringe-worthy merger of Sue proportions. Can also include Fuck Everything and Everyone.
This Is A Public Library- The Displaced ends up invariably shacking up with Twilight Sparkle in the Golden Oaks Library, or post-Tirek the Castle of Friendship.
Remember the New Prince(ss)? - Through marriage, adoption, or siblinghood, the Displaced is related to the Princesses of Equestria and thus has a royal title.
The Chosen- For some reason, the Displaced is the only one that can do anything to the antagonist at all, including the antagonist’s underlings. The ponies are left to depend on the Displaced, even though they have been shown to be perfectly able to fight back using the Elements of Harmony. This tends to go along with Ain’t No Mountain High Enough.
I’d Like to Be A Tree - The Displaced first enters Equestria in the Everfree.
I’ll Be Back, Baby - The Displaced has a grudge or wants revenge on the Princesses. Goes hand in hand with Stoned on occasion.
You CAN Thwart Stage One - In which the Displaced uses their knowledge of canon in order to head off villains of the week/season finale off at the pass.
I’m King O’ The World- The Displaced wants to rule Equestria, the World, the Universe, or anything in general. Can be accompanied by Diplomatic Immunity Ain’t For Me.
Ultimate Irony - The Displaced in question is a sociopath. Tends to be more effective (read: ironic) if the Displaced is The Chosen.
What Is It Good For? - The Displaced gets involved with or even starts a war. This can be as little as a conflict contained between two countries in their adopted universe or extend up to and include levels of the Wars.
TWAS I- The Displaced has some sort of involvement, usually villainous, with past tragedies or events, such as Nightmare Moon or Discord.
Diplomatic Immunity Ain’t For Me - The Displaced can violate laws and other legal requirements of Equestria without getting into any trouble.
Pleasure Dome - The Displaced story is only used as literal wank material.
We’re All Friends Here, M80 - The Displaced becomes or is friends with the Elements, Discord, the Princesses or so on so forth. Could include TWAS I.
Sub-Trope:
I’ve Got Friends On the Other Side - The Displaced was friends with Discord before he was reformed.
Eskimo’s Are A Pony’s Best Friend - The Displaced ends up in the Crystal Empire, or the Frozen North, in the beginning of the story.
I am the Prettiest Pony Princess in All the Land - The Displaced saves Equestria, or otherwise, and is rewarded in one form or another. Most notably this includes getting the Crystal Heart, beating Sombra, or beating Tirek.
Flyswatters Aren’t For Kids - The Displaced beats Chrysalis, enslaves the changelings, rules the changelings, or some variation thereof.
Off With Their Heads - The Displaced kills off a canon character(s).
These Boots Were Made For Walkin’ - The Displacer, most notably the Merchant, allegedly has some master plans and it is referenced as such in the story.
And That’s Just What They’ll Do - The Displaced agrees with or follows through with someone else’s plans, typically not giving a reason.
We’re Roomies! - The universe contains multiple Displaced.
This is YOUR side - One of the Displaced is beloved by ponies and the other is hated. Typically a hero-villain relationship.
The Laundry Room is Down the Hall - The Displaced start living together.
OH HO, OH No You Didn’t - The Displaced overreactions to a very normal and calm situation.
Oh Yes I Did - An argument of morality and ethics starts, between Displaced and pony, for no clear reason.
This is MAH Kingdom - Celestia is a paranoid xenophobe.
I’m in love with the cocoa - The Displaced quickly and easily adapts to Equestria and their situation for no reason.
Damn it Harvey - The Displaced is insane, usually for no given reason.
I’m Really Digging These Threads - The Displaced wears ONLY their cosplay costume and the clothes, never changes.
Um… Who Dis Be? - The Displaced has amnesia.
Thas Not My Name - The Displaced no longer uses their human/given name.
One MILLION Bits - Money is no issue for the Displaced.
Lady Luck Weighted the Dice - The Displaced is absurdly lucky.
Funded By Trump - The antagonizining force is non-human and non-pony
I am the Bible - Also could be called The Messiah Syndrome, the Displaced claims to be better, stronger, and smarter than the ponies.
By the Power of Grayskull - The antagonist is a Void Dweller.
Long Live SCIENCE - The protagonist denies the existence of magic.
Your Whole Life is a Lie - Magic is a kind of science.
Burn the Heretic - The protagonist argues, and possibly proves, the Diarches do not raise the sun and moon.
The Student Is The Master - The Displaced learns everything at an incredible rate, mastering things at a ridiculous rate, or already knows how to use all of their abilities.
Let's Go Fishing - The ponies eat something entirely unexpected, such as fish or meats.
Pandora's Box - The Displaced is the source of trouble, pain, etc for the ponies and Equestria.
Genocide Run - The Displaced wants to kill anything and everything for some reason.
I Am The Animu - The protagonist is constantly sought after by the ponies and typically remains blissfully unaware of said fact.
Tsundere Sharks - The pony, or ponies, are out of character in a romantic relationship. Can partner with Fuck Everything and Everyone as well as I Am the Animu.
All That And A Bag Of Chips - Any, and all, canon characters are extremely out of character.
Just Having a Bad Day - Something goes incredibly and crazily wrong, but, as soon as the Displaced gets involved, or the next time it happens, the situation is fixed somehow.
That Time Of The Month - also called Kat's Had A Bad Day. The characters are super emotional.
2Spoopy4Me - The Displaced runs away while music plays, typically in the form of a hyperlink or a Youtube Video.
They Sprinkled Crack On My Cereal - The story focuses primarily on what the author deems important, emphasizing these parts to the extreme, while glossing over the main details of the story.
I'm Just A Teenage Dirtbag Baby - The Displaced despises and hates all other Displaced.
Find You've Got The Music - The Displaced's displacer is Essence.
Happenstance, Smappenstance - The Displaced, upon being summoned, complains about having been doing something important.
I Took the Road MOST Travelled By - The Displaced summons another Displaced to assist them out of a situation.
Don't Use Bing, Google It - The Displaced uses simple and idiotic ideas to justify their actions.
I'll Get the Popcorn - The Displaced watches Discord get imprisoned and doesn't interfere, either time.
I Know You Are, But What Am I - The Displaced gets in a fight without whoever summoned them over a trivial and simple issue.
Nobody Expects The Spanish Inquisition - The Displaced easily defeats the princesses or main six.
Daddy/Mommy Dearest - The Displaced adopts Scootaloo or another canon foal.
Where Art Thou Johnny - The Displaced loses something important upon their Displacement and tries to get it back.
I'm Sorry, Wilson! - The Displaced's family, adopted or otherwise, is subjected to some tragic events, possibly even dies.
Do You Even Lift Bro? - The Displaced flaunts their power or beats a canon character with ease.
Faster. Better. Stronger. EVERY TIME - The Displaced comes back from a defeat and kicks the antagonists arse with extreme ease.
Can't Believe My Eyes - The story in question describes things with pictures and interjects with a youtube video at some point.
Hitler Did Nothing Wrong - The Displaced is instantly hated by the ponies, whether world-wide or just small groups, the instant they enter Equestria.
And... Scene! -The Displaced faints/blacks out before ending up in Equestria.
Frozen Brain Surgery - The Displaced experiences headaches when arriving Equestria, and they have no explanation, usually.
My Name is Leroy Jenkins and Welcome to Jackass - The Displaced shows an overarching tendency to rush into things without a plan or an idea in general.
Wow, that went fifty feet Harry! - The Displaced does something that's considered impressive by the ponies or the author. Usually something considered powerful.
I AM LORD SHEN - The Displaced has a pissing contest with someone, literally could be anyone, or something, literally could be a pebble named Joe that he found on the bend of the river.
Meet Bella Swan - When two characters, namely a Displaced and a pony, get together for some reason and it just works because MAGIC.
Dash of Pride - Gay instance of Meet Bella Swan.