This is a collection of the most upvoted designs on Present-Peace's build a character posts, we took the liberty of altering phrasing for clarity or consistency, and adding flavour text to those that didn't have any.
Creators are listed with their characters.

BASSOONIST
Each night*, you learn if yesterday's killed executee is closer to a Demon than a Minion.
“There once was a brainy baboon, Who always played a bassoon, For he said, It appears, That in a billion years, I shall certainly hit on a tune.”
Ability by u/Square_Row_22.
Townsfolk

LONGBOWMAN
Once per game, at night*, you may kill 1 of the Townsfolk with the most steps (living players only) between you.
“Steady... Hold... Loose!”
Ability by u/Visual-Affect-9758.
Townsfolk

INQUISITOR
Each night*, you learn your nominee’s alignment. If you learn evil, you lose this ability.
“No one expects the Spanish inquisition!”
Ability by u/Logical-One-2831.
Townsfolk

BROWNIE
Each night*, choose a character, if that character is in play and drunk or poisoned you gain & immediately use their ability.
“We Brownies know when a job’s not done right.”
Ability by u/TurtleLurky.
Townsfolk

SCOUT
You are unaffected by Minion abilities. If chosen by a Minion, you learn this.
“I have trod these paths, roved these hills, I know every leaf and mound. I know a footprint that doesn’t belong.”
Ability by u/Visual-Affect-9758.
Townsfolk

BOUNCER
Each night, choose a player (different than last night). Players that choose them tonight are prompted to choose differently.
“You’re not allowed in.”
Ability by u/Spacetauran.
Townsfolk

CRABBER
Once per game during the day, visit the Storyteller for some advice that would help the other team win.
“Snippy little blighter aren't ya'?”
Ability by u/Visual-Affect-9758.
Townsfolk

CARTOGRAPHER
On your first day you may publicly guess the distance between you and the nearest player of each character type. That night, you learn how many you got right.
“Best maps you’ll find of here anywhere. What do you mean ‘the fort is on the next hill’?”
Townsfolk

DIVER
On your 1st night, choose a number (2 or higher): on the equivalent day, you privately learn that many pieces of true info from the Storyteller.
“You can find trinkets in the shallows, but the interesting stuff is always deeper.”
Ability by u/whengrassturnsblue.
Townsfolk

COBBLER
You start knowing how many Townsfolk-Outsider pairs there are.
“An Oxford and a Derby? Well those just don’t match at all, do they.”
Ability by u/UnintensifiedFa.
Townsfolk

MUSKETEER
On your 1st day, publicly choose 3 players. That night, if any of them are evil, you die.
“All for one, and one for all!”
Ability by u/julietfolly.
Townsfolk

TAILOR
Each night, choose a player: if executed tomorrow, they learn you are the Tailor.
“I don’t like making funeral clothes, but I won’t do anyone the disservice of a shabby death.”
Townsfolk

MERCHANT
Once per game, during the day, privately ask the Storyteller for info & state a price. The Storyteller may refuse or bargain with you.
“If you don’t like the price I’m always up for haggling.”
Townsfolk

WAYFINDER
You start knowing if you are closer to the Demon than you are to a Minion. If equidistant, this info is arbitrary.
“The stars and the currents are a better guide than any map.”
Townsfolk

TREANT
When the dead equal or outnumber the living, all players learn you are the Treant. If you are mad that you are the Treant, you lose this ability.
“Songs like trees bear fruit only in their own time and their own way; and sometimes they are withered untimely.”
Townsfolk

GRIFFIN
Once per game, you may visit the Storyteller: if there are no living Minions or Outsiders, you learn the Demon player. Otherwise, get false info.
“Behold my challenge, Demon—for I am the king of beasts both land and air. ”
Townsfolk

AVIATOR
You start knowing the length of the longest line of good players.
“The desire to fly is an idea handed down to us by our ancestors who looked enviously on the birds soaring freely through space, on the infinite highway of the air.”
Townsfolk

MASON
Masons start knowing a secret word. If there is only 1 Mason, a Minion learns the word. [+0 to +2 Masons]
“Truth is not lost, yet it must be sought for and found.”
Townsfolk

RAT CATCHER
If you are nominated & the nominator is a Minion, they are executed immediately.
“Not a mouse. Never a mouse. Always a rat!”
Townsfolk

COLLECTOR
Each night, choose a character. If you have chosen all alive characters, your team wins.
“What do you want for that holo-foil Ancient Ice Dragon? I need it to complete my Lords of Barrenpeak set.”
Ability by u/kikislesbianaunt.
Townsfolk

CARPENTER
If you are executed on your 1st day, you are resurrected on your 3rd.
“Through nails and wood, I am restored.”
Townsfolk

TANNER
On your 1st day, publicly choose any number of players. That many nights later, you learn how many are evil.
“Don't mind the smell, it's good quality, anything big will take time though.”
Townsfolk

FALCONER
At night, if 4 or fewer players live, choose a player (once): you learn their character. (Travellers don't count.)
“The hatched chick cannot go back to the shell, the falcon who has found the sky does not willingly sit the nest.”
Ability by u/Hermononucleosis.
Townsfolk

ELEMENTAL
If you die at night, a Minion might die.
“**FWOOSH!**”
Townsfolk

SAPPER
Once per game, at night*, you may make all other Townsfolk safe from the Demon tonight.
“Dig in.”
Townsfolk

COACHMAN
Once per game, you may publicly choose up to 3 players. Tonight, if any are evil, all chosen good players die.
“Where to this fine evening?”
Townsfolk

BLACKSMITH
Once per game, at night, choose a player (not yourself): the next time they die, they don't.
“Strike while the iron is hot.”
Ability by u/fractalhack.
Townsfolk

SENTRY
Each night, choose a character: you learn how many steps from the other Sentry to that character. If not in-play, this info is arbitrary. [+1 evil Sentry]
“You can only ask one of us. It’s in the rules. And I should warn you that one of us always tells the truth and one of us always lies. That’s a rule, too.”
Townsfolk

SENTRY
Each night, choose a character: you learn how many steps from the other Sentry to that character. If not in-play, this info is arbitrary. [+1 evil Sentry]
“You can only ask one of us. It’s in the rules. And I should warn you that one of us always tells the truth and one of us always lies. That’s a rule, too.”
This is here since the Sentry makes an evil Sentry.
Townsfolk

CONTRARIAN
You may only nominate if another player is about to die.
“Clearly none of you got a proper education, as someone versed in forensics AND mystery novella, it’s OBVIOUS the butler didn’t do it.”
Ability by u/ContentConsumer9999.
Outsider

POLTERGEIST
You think that you are a Townsfolk but you are not. Tomorrow, you become that Townsfolk & your left Townsfolk neighbour becomes a Poltergeist.
“*CRASH!* *BANG!* *CLATTER!* *CRASH!*”
Outsider

COLOSSUS
You may not leave your seat to talk in private.
“Why, man, he doth bestride the narrow world Like a Colossus; and we petty men Walk under his huge legs, and peep about To find ourselves dishonourable graves.”
Outsider

SAMURAI
On your first night, choose a player (not yourself). If they die by execution, you become evil tonight.
“The essence of Samurai is not just service, but loyalty.”
Outsider

SHUCK
Each night, choose a new player: a chosen Minion’s ability works twice or is regained until dusk. If you die by execution evil players’ abilities work twice or are regained until dusk tomorrow.
“Only evil will hear my howl.”
Outsider

PRIVATEER
If all other Privateers are dead, all other good players are drunk. [All Outsiders are Privateers. +0 or +1 Privateers]
“Now I'm a broken man on a Halifax pier, the last of Barrett's privateers.”
Outsider

MOONSHINER
When you die, your team is drunk until dusk. If it was by execution, your team is drunk until dawn.
“Whooee! That’ll put some hair on yer chest!”
Ability by u/tstaffor.
Flavour by u/plumper303.
Outsider

NINJA
Once per game, at night*, choose a player: they die & learn that you are in play. Until you do this, you might register as good & as a Townsfolk or Outsider.
“The most lethal blade is the one left unseen.”
Ability by u/Visual-Affect-9758.
Minion

KIDNAPPER
On your 1st night choose a good player: they become evil. They become good if & only if you die by execution.
“If you ever want to see them again, you’ll do exactly as I say.”
Minion

HOMUNCULUS
You start knowing an in-play Townsfolk. If you are mad that you are an in-play Townsfolk, you register as good & as that Townsfolk & that character registers as an evil Demon, even if you are dead.
“The world is big, but little people turn it around.”
Ability by u/julietfolly.
Minion

VAMPIRE
Each night*, choose a player & guess their character: if correct, they die.
“May I come in?”
Minion

WARLOCK
Each night, choose a player: if they are nominated tomorrow, their nominator dies. When just 3 players are alive, you lose this ability.
“Hair in a lock, spittle in the vial, blood from a drip, brewed is the curse, sealed is the pact, should any lay a hand upon thee they will feel the Reaper’s gnarled grip.”
Ability by u/BabyYoshiBops.
Minion

OUTLAW
Each night, choose a player: They learn you are in play & the previously chosen player guesses who you are: if wrong, they die.
“You can tell 'em I'm comin'. Now, are you gonna pull that pistol or just whistle?”
Ability by u/MeatThins_Homebrew
Minion

MARE
On your 1st night choose a player: they are poisoned. If they are mad that they are poisoned, they might die. if they die, choose again.
“Sweet dreams... and remember, I wasn't here.”
Ability by u/FinnDarkmouth
Minion

EMISSARY
Each night, you learn a secret phrase. If the Demon says it publicly tomorrow, a player might die.
“My Lord, I bring you a wonderful message—bad news.”
Minion

KOBOLD
Each night, choose a player: they learn this. If nominated by a good player tomorrow, they are immediately executed.
“Yip, me kill!”
Minion

MIMIC
Each day the 1st living player to be publicly mad you are good might die tonight. You might register as good & as a Townsfolk or Outsider.
“'C'mon, it's perfectly safe.”
Ability by u/Duck-Lord-of-Colours
Minion

MANANANGGAL
Each night*, choose a player: they guess who you are, if correct, you die, if wrong, they die.
“The earth has has no rage like love to hatred turned, Nor the skies a fury like a woman scorned.”
Minion

KRAKEN
Once per game, during the day, the Demon may publicly claim you are in play: only you can die by execution from then on.
“Release the Kraken!”
Minion

DRAUGR
Once per game, at night*, you may die. Once per game, at night*, if you are dead, you may be resurrected.
“To my grave, from my grave.”
Minion

WYVERN
Each night*, choose 2 players: 1 dies, 1 is poisoned. Votes cast by players poisoned this way count as 2 votes tomorrow.
“The Wyvern is a mighty beast, its claws are sharper than swords and its poison more potent than any, but should you venture into its den and live, you may come out richer, albeit rarely unscathed.”
Demon

JORŌGUMO
Each night*, choose a player: they die. Each night, the 1st player to choose you with their ability is poisoned until dusk.
“Come, come, I won’t hurt you, not yet. You’ll taste so much better after a few days in my web.”
Ability by u/numberguy9647383673
Demon

LINDWYRM
Each night* choose a player: they die. Each night, choose a player (different to last night): if they are executed tomorrow & are a Minion, choose an extra player to die tonight.
“Come. Guard my treasure—or perish.”
Demon

CHEESEMONGER
If you made 2 unique puns today, you cannot die by exile.
“My cheeses are all very gouda. I guarantee you won’t brie disappointed!”
Ability by u/No-Pomegranate8440.
Traveller

TENGU
Each night, choose a player: you swap seats. Your neighbours are drunk.
“Which wind brought you here?”
Traveller

NACHZEHRER
Each night, choose a player. if you are exiled, the previously chosen player is executed immediately.
“You. Come. Too.”
Ability by u/SubspaceEngine.
Traveller

HIKER
Each day, you may move your seat to any place in the circle.
“I don't get lost, I just take the scenic route.”
Traveller

MAGISTRATE
Something bad may happen to any player (not the nominator or nominee) who speaks without permission from either the nominator or nominee during a nomination.
“ORDER! Let us hear from both the defence and prosecution—no one else for now.”
Fabled

MILLER
Players nominated more than 3 times might be executed immediately.
“Time and stone will grind anything down to a fine powder.”
Loric Ability by u/kingsif
Fabled