It's an ensemble show, so none of the characters really stand out as funnier than the other; the comedy works best when they are together and their different personalities play off each other.
Having said that, I like Mint's obsession with costumes and the odd sound effect of her cat ears when she gets an idea or is excited. I like Ranpha's scheming (plus she's hot :anime: ). I like Forte's lust for guns. I like Milfuelle's incessant optimism, which teeters in the category of absent-mindedness. I love every line that Normad says- he's a riot.
Probably the one I like the least is Vanilla, because while her dedication to God is nice, she blurts out random philosophical phrases when they're barely called for. It was funny in the first three volumes, but by Volume 4 I was getting annoyed.
"You have the right to remain silent. But then again, you have the right to spill your guts and really blow it for yourself!"- Goofy, after arresting Pete and Peg