Sturgeon's Law applies heavily to characters with mental illnesses. Some people manage to play them well, most people don't. When in doubt, exercise caution, be respectful, and do research to make sure you portray the disorder accurately instead of going for a Holywood version.
Also, reason is important. If you give your character a disorder in order to make them cooler, more speshul or edgier, then you're doing it wrong and I guarantee you're not going to play it in a tasteful manner. Bonus points if it's multiple personality disorder.
Also, reason is important. If you give your character a disorder in order to make them cooler, more speshul or edgier, then you're doing it wrong and I guarantee you're not going to play it in a tasteful manner. Bonus points if it's multiple personality disorder.