4chan chooses it's own characters.
Yotsuba as the mascot
Tsukasa as its princess
Makoto as its pimp.
Mayuki and Yuki as its whores
You can never control it. I think Tsukasa became the princess because she embodies alot of the fetishes that 4chan likes more than most of the other anime characters out there. Cute, likes to stay in the Kitchen, loli like body but still legal, fun to be with, and easy to manipulate.