Skadi has some good advice up there for a team comp.
But... I see you have Hotatsu fully leveled. If he's masteried, I'd give him a shot in CB. He's got a nice defensive aura, a leech, a decrease attack, an increase defense and continuous heal. He also self-cleanses the CB stuns. I might be playing around with something like:
Hotatsu, your lead, does all kinds of CB goodness, see above.
Ninja, has HP burn, decrease defense, extra boss damage, hits hard.
Skullcrusher, ally protect, counterattack, shields, can also cleanse stuns.
Frozen Banshee, poisons, poison sensitivity
Last slot, utility, I'd want to try out Uugo for her leech and heals. This would enable you to not have to worry about lifesteal gear cause you'll have leech up almost every single turn. If not Uugo, give miscreated monster a try and you could have him pop his shields when Skullcrusher's go down!