group
ADHD, Autism, and Epilepsy are all actually things I've been wanting to give characters, but honestly I don't know where to start with any of those.
I've written a character having a seizure, and he'd had them before, but it wasn't epilepsy. It was a side effect of magic power overuse (I had various side effects associated with different types of powers).
I have autism (Aspergers) and ADHD. If you have any questions about them, feel free to shoot me a PM!