"I've always liked Chomper. He's one of my favourite characters and the only character that I like in the television and movie series. "
Chomper's one of the only characters I liked in the TV show, too. Mainly because he's the one who reminded me the most of a little kid. He also had a great personality.
As for him in fanfictions, I've only read a few LBT fanfics, but he was great in LBTFan13's(?) Revenge books! Those fanfics are toned up more from the movies, ie PG - PG-13, but Chomper still stayed true to his character, which was cool. In a lot of fanfictions of all franchises, the characters are only a tad bit like their actual selves.