HilaryWitt
2012 series. Humanized Leo, Raph, Donnie and Mikey aren't related by blood, but they all see each other as brothers. They are all the same age just a few months apart. They're orphans who all share a room due to having medical health issues. Leo has OCD, Raph is bipolar, Donnie is autistic, Mikey has ADHD. They all have PTSD due to how they lost their parents. Splinter adopts them.
Also On FanFiction https://www.fanfiction.net/s/14357800/1/Mental-Health