Just figured I'd throw some class ideas out for the hell of it
Ripper - Melee based, uses claw enhancements ala Brass Knuckles, but for RIP AND TEAR.
Soldier - (Based on Soldier Crabs) - Offensive, uses hit and run tactics, often travel in squads (Several weak PCs controlled by one player?)
Fiddler - (Based on Fiddler Crabs, herp derp) - Support, buffs, healing, debuffs, etc.
Assassin - (Based on Japanese Spider Crab) - Agile, aims for a 1-hit KO then GTFO.
Don - Intelligent, charismatic, slow, defensive, manipulative.
Thumbnail - (Thumbnail Crab) - Intelligent and stealthy, recon and spying.
Eh, that's all for now. If people care I'll pull some more out of my ass later.