This game is simple. One person will post two characters who have something in common (they could be from the same anime, have the same hair or eye color, their names could start with the same letter, they could both be yanderes, as long as they have something in common), state where they're from, and what they have in common. The next person will then state which one they prefer and why, and them repeat the process.
If you don't know either of the characters you mat say "Pass" and move on.
You can also post a picture of the one your prefer, if you wish.

For instance:
Person#1: Naruto Uzumaki from Naruto vs. Sakura Haruno from Naruto, they're both from the same anime.
Person#2: Naruto, because *insert reason for liking them better here*
Lucy from Elfen Lied vs. Amu Hinamori from Shugo Chara, they both have pink hair.
Person#3: Pass. Shiro from Deadman Wonderland vs. Mei Misaki from Another, they both have red eyes.

And so on. Have fun! I'll start:

L from Death Note vs. Sebastian Michaelis from Kuroshitsuji, they both have black hair.