The game is simple. Someone lists one or two details of an anime character they're thinking of (no more than two, or else the character will be too obvious), and the next person tries to guess who that character is. Here's a couple examples.

Poster #1: Long pink hair.
Poster #2: Moka Akashiya. Long orange hair and mole on his/her chin.
Poster #3: Rangiku Matsumoto. Very girly looking.
Poster #4: Italy. Sandy blond hair.