Need some help with teams.

I have two teams right now. One is the zhu yuan team with Nicole and anby. The other is the fire team with solider 11, Ben and Lucy. I just built Caeser so she'd replace Ben in the solider 11 team right? What are some grace teams I could make? Would her build be different in them? The ones I'm thinking of are Grace, Seth and Rina or Grace, Rina and Anton. I lost on Jane's banner so I'll get her when she has a rerun. That team I'm thinking would be her, Seth and grace. Is there a way I can run billy and Caeser together? If so who would be the last one in that team?