I need help building a team

Your characters are extremely outdated. But the best possible team out of that would be SP green piccolo/SP demon king piccolo and janemba. + some bench buffers. But you should really try to get some new characters. Almost none of the others are even playable anymore. (except for red broly who is very playable. But you have him at 0 stars. So hurry up and farm him in the events)