Question about teams

Fist Question: I just got Arlecchino when her banner came out. Sadly not the weapon. Ive been playing since the Xbox console vision came out and only have these characters. Is the team in using decent or should I replace some with a different I have as it'll go well with Arlecchino?

Second Question: What Characters do I want to look out for Arlecchino as their amazing with her? Like a need/must have/ and not high priority.