Serf is a shark that's about 6'5" to 12' (he has macro growth powers) and God knows how many pounds. He's huge all over, muscles AND gut, and he's skilled with water magic and a fishing pole with deadly hooks. (Yes, btw, that's a brass fishhook for an eyebrow piercing.) He can not only set up intricate tripwire traps with specialized fishing line, he can also hook you, yank you over, and nail you with his brass-knuckled fist.
He's a nice guy at heart, even though he's a mercenary by trade. He's playful and friendly, just...don't tick him off. Or you WILL be dead. He uses a load of fishing and ocean analogies in his speech.
Also: You can't see it since he's using a spell to hide them to keep this PG, but he's got nads the size of basketballs (proportionately) and two huge wangs each as thick and long as his arms. And he's bi. Please ask before doing him, though. Rape ain't cool.