From the anime Ebichu, Maa-kun is Kaishounachi's co-worker at the office. They tend to get together with their girlfriends a lot and group date.
Why I like him: He's in love with Ebichu... Who just happens to be a hamster.
Why I hate him: He wasn't in the anime more. (not really his fault)
Overall: Maa-kun's character brings something weird to an already messed up anime. I would go so far as to say he's the best character in it and he was the only character to make me laugh. Being sexually aroused by a hamster is hilarious. Especially when he's imagining doing it with Ebichu when he is in fact doing his girlfriend. XD