I was overlooking some other threads and it sometimes seems like characters fit the archetypes of the MBTI nearly exactly. I'm trying to compile at least one for each type here.
Feel free to refute the ones on the list if you have adequate reasoning. I'm trying to get at least one character for each type, but if you can find more than one per type, feel free to add them. I'll start out with a few, but I'll update the list:
ESFP: Naruto Uzumaki, Naruto
ISTP: Muugen, Samurai Champloo
INFP: Dream, The Sandman
INFJ: Huey Freeman, The Boondocks
INTP: L, Death Note