Asajj: dispels and stun
B2: dispels positive effects, inflicts immunity buff, and unless is specially targeted will get relentless barrage going off constantly
Boba: can ignore taunts, rack up big numbers with execute, and can ability block him and chirrut
Echo: dispels
Geonosian spy: dispels and gets a damage boost from it
Mace windu: dispell
Qgj: dispell
Sun fac: dispell on his basic
Teebo: dispell
As for chirrut any character than can abilty block is good with him only have 26% tenacity and baze himself is the slowest in the game