From the anime Compiler, Nachi Igarashi is the older brother of Toshi and they have meet 2 beautiful ladies that decided to move in with them. Nachi comes off as a lazy man that likes to chase as many women as possible. He likes to go out and get drunk which always ends in him breaking some poor girls heart.
Why I like him: Mmmmm I guess I liked how things ended with him. He wasn't all that impressive of a character.
Why I hate him: Womanizer to the extreme. He acts like such a jerk all the time. I dunno what Compiler sees in him.
Overall: A very fun and nerdy show that I wouldn't have minded actually watching a full on series of.