My (very random) headcanons for TMNT2012 (made up by me or taken from other versions/fans):
The brothers all have Facebook accounts, have like 5 friends and constantly post inside jokes that April and Casey don’t understand half the time.
Raph is really good at math but it’s never addressed because he’s still way behind Donnie.
Leo is Mr. Perfect at everything except he can’t cook, sing or whistle if it meant saving his life.
April thought them all to drive (Leo was the worst student to work with).
After about a year Chompy grows into the size of a St. Bernard in a span af a few months then stops growing again for a while. Raph still insists he fits on his shoulder.
Leo has accounts on multiple Space Heroes fansites and writes fanfiction - the bad kind, with a lot of cheesy oneliners.
Donnie and Raph are both really good at drawing while the other two aren’t at all despite Mikey liking to draw.
When they were little Mikey and Raph would fight over the night light because Mikey didn’t like the dark but Raph hated the light because it attracted insects.
Leo’s partly at fault for Raph’s bugphobia.
Splinter didn’t think the turt babies were very intelligent until the first one of them spoke.
Raph was the shortest for a really long time.
Casey’s parents are both alive although divorced. He often visits his mom outside the city that’s why he’s not in every disaster episode.
Mikey has a secret notebook for his pranks where he has all of his brothers’ likes, fears and weaknesses documented and it quite freaky how thoroughly analized inside-out he has all of them.
Splinter was depressed at the time of his mutation (the mutation making it only worse) and the baby turts dependence on him was the only thing keeping him from commiting suicide in the first couple years. :(
Donnie was the first one of them who got dead drunk.
Karai (without wanting to) still considers the Shredder as her father more than Splinter.
Mikey doesn’t have to do daily chores around the lair because he’s the family cook.
Donnie hacks into satellites for fun.
Leo took the “pinkies out” to heart and never holds cups differently.
Splinter has been doing the “healing hands” for years on that poor tree to keep it alive with so little sunlight.
Casey has a grandma from former Yugoslavia and he got that čefur[gopnik] in his blood.
Splinter loves Spanish soap operas and with whoop ass if the boys don’t get off the TV when they’re on.
Donnie sometimes runs on coffee alone for days.
Raph has a secret DeviantArt account (and I support him).
The boys decided (with a bit arguing) who’s the youngest to oldest when they were little.
Mikey has ADHD Donnie said so.
Angel makes subtle Shrek puns/jokes around the turtles, mostly Raph.
If there’s no training Leo sleeps until noon.
Splinter didn’t have the white fur from the beggining. It came with years of stress caused by 4 hyperactive boys.
Renet likes to pop up unannouced just so she can eat real 21st century food and not future artificial muck.
Raph has seen himself in eyeliner thanks to April and “spin the bottle.”
Mikey has a layer of soil under his bed from decayed food.
Donnie’s part of a LARPing group at some random kid’s basement.
Raph once had a realization nightmare that Slash might remember everything pre-mutation, and dearly hopes he has no memory of all of his “alone times” in his room.
Karai will one day walk into the lair with bleached eyebrows and no explanation.
We never realized it but Casey’s tooth gap expanded for one more tooth thanks to Raphael.
Shredder loves his dog Hachiko.
April encourages Casey to cheat on exams because he’s a lost cause.
Donnie owns stock and runs a business from his home computer and buys all the food for the family.
Casey is like a dog after taking a bath: fricking terrified until he dives into the nearest (manure) dumpster and gets that familiar smell back.
The boys all have low self asteem due to them being outcasts.
Raph is a whisperer for all animals smaller than him (the horse is proof).
Mikey will eventually rescue another cat and name her Klunk.
When they arrived at the farmhouse for the first time Raph refused to go into the forest/meadow for 3 days because he saw a grasshopper(!!!) in the grass by the porch.
Mikey was super excited about owning chickens and loves petting them.
Leo still gets days when his healed knee hurts too much to support his full weight.
When April grows up she becomes a detective.
Casey’s a garbage collector and still busting heads.
When Raph was 13 he wanted to go to Hot Topic (I’m pretty sure he still does. -The fishnets gave him away.).
In the future the turts all have their own weird bunches of human friends that they hang with sometimes.
I’ll end it here before this gets out of hand! I excluded headcanons about ships, crushes, sexual orientations, etc. to avoid pointless discourse and hate. Don’t mind adding your own headcanons to this post. :)