I'm pretty sure I saw a topic like this, but i can't find it so I'll make one myself. I'm not just looking for a manga involving MPD, I also want to know a series that was turned into an anime. The character is not aware of his/her other side's activities whenever they take over. As they speak, their other self's mannerism and voice should sound like a completely different person(like two people sharing the same body). Depending on the character's personality, their other self should be the complete opposite. And by any chance, the character's other self does not reflect his/her own personality; completely unrelated, with no traits of the original, is a bonus to know.

I don't know any anime characters, but Two-Face and Scarface in Batman TAS is a good example to follow.

[img]http://i30.photobucket.com/albums/c303/jasonpark1987/0c01ca55-eed4-4af9-a361-1d424276fe1e.jpg[/img]

Try this thread.

Probably had trouble finding it since it's misspelled.

If you've ever thought or said "Nice Guys finish last" and really meant it, then you should probably read this LJ post by DivaLion. It's incredibly insightful whether you're male or female.

From a bumper sticker I like:
"If you're gonna ride my ass, at least pull my hair."

Mahoraba
there are some others but this one comes to mind first

Lalala~

from the ones that isnt listed in the thread mentioned a couple of post above or mentioned yet only change 123 comes to mind

I'm not very far into it, but 3x3 Eyes seems as what I've read so far to fit your needs. 🙂 I'm pretty sure it was turned into an anime, too.