Rare and underrated characters that you use or fight in the arena?

There’s a team I face in Arena that’s an absolute nightmare, I run a KRU squad and usually I have good enough control to beat most opponents on offense, but I simply have no answer for it:

AA lead, CLS, HY, GK, GAT.

So many non-attack specials that CLS just goes ham, absolutely crushing opponents, with plenty of heals and cleanses and buffs goin on behind him in support. It’s a REALLY nasty team.