It's not too bad. Kaioken Goku and purple broly are both monsters.
I'd say main team: Kaioken Goku, Purple Broly and Red Broly.
Bench: Green Bardock which you can switch in incase the enemy brings a high priority target blue unit, and for the last 2 slots bring some buffs. Shallot, EX Radditz or SP ssj Goku Red.
The 1 star Red broly will be a bit weak tho. You should really try to get a SP gogeta or SP SSJ Kale Berserk. Some strong RED sayjan
character.