Akane Serizawa

Blood Type: O
Zodiac Sign: Gemini

Akane is an enthused student who likes to over-dramatize things. She is a member of the drama club and enjoys donning costumes and tricking her more slow-witted schoolmates, such as Himeko. The sharper characters, usually Rei or Miyako, see through her schemes easily but usually allow her to continue for a while for entertainment. She is notable for her nekomimi (cat ear) hair (she has a normal set of ears hidden under her hair) and her vicious humor — she frequently imitates Jason Voorhees and wears a hand puppet of him to scare the others. The costume of hers that reoccurs the most in the anime is a robot named Roboko, literally meaning "Robot girl."
One notable episode shows her in a dramatic fight against Yuzuko Kurusu of the Movie Club as Godzilla VS. Robot. Akane and Yuzuko are a canon "yuri" pair in the manga, and the anime gives a small indication of their developing relationship. Serizawa is also considered a pseudo-main character; she has so much interaction with the main cast from class 1-C that she often appears with them or being included in the production of official merchandise such as figurines that don't include the other main characters.

(Source: Wikipedia)