What characters look well-adjusted on the surface but have issues behind closed doors? This is an actually understatement, they’re crazy. Examples for me include Light Yagami (Death Note) and Shou Tucker (Fullmetal Alchemist)
What characters look well-adjusted on the surface but have issues behind closed doors? This is an actually understatement, they’re crazy. Examples for me include Light Yagami (Death Note) and Shou Tucker (Fullmetal Alchemist)
It’s been a long time, but I seem to remember that some of the characters in Mirai Nikki appear superficially sane until you get a better look at them. (The others are nuts from the get-go.) In general, any deadly-game type anime has a decent chance of containing a character who seems sane until they turn on the protagonist.
A lot of yandere types would also qualify.