The second Biscuit robot created by the professor. His appearance is similar to the old model Biscuit No. 1, the only difference being the number of the hat. Unlike Biscuit No. 1, Biscuit No. 2 was built with the intention to speak. (Source: Wikipedia)
A coal miner, and one of Jörmungandr's and her sister's 5 fathers. (They adopted them)
The main characters homeroom teacher. Shown to be very witty and banterous. His hatred for Sasazuka-kun is also very clear from episode two.
Makoto's 17-year-old sister (currently 19). Initially she has a rather romantic look on a relationship, and her quest for true love lets her drift through a number of affairs before she finally finds happiness with her first boyfriend, Yosuke. Her experiences and introduction into the sexual world are followed throughout the series. (source: http://en.wikipedia.org/wiki/Futari_Ecchi)
Me-Mania is one of Mima's biggest fans, to the point where he is totally obsessed with her. When Mima starts to do things that go against his expectations of her, he becomes a stalker believing himself to be led by a "true" Mima.