Her name's Carina or whatever. She's supposed to be an alien pretending to be human. The hair things are sensors apparently.
She's loud and says dumb stuff without thinking. Then pretends she's just a kid when people get mad.
Never gets sick because cartoon logic. Picked "Kaizan II" because it sounded cool.
I wrote this garbage 5 years ago and I'm not translating the rest. Google Translate the Chinese version if you really care.

真名是Carina，
化身成人形來地球玩的外星種族。
兩邊的金色毛髮實際上是感應器管。
精力旺盛又很吵鬧，坦率的直球型選手。​
​做事從來依靠直覺永不三思，想到什麽就會立馬行動。
總是以年齡小為藉口進行衝擊性暴言，發言一分鐘后又光速反悔。
非常抗揍，還永遠不會感冒，畢竟是笨蛋。
「海山二」這個稱號只是單純覺得很帥又和自己名字有關聯，
一拍腦袋決定的​，并無深意，​畢竟是笨蛋。