Hello! I was wondering what is the best number of agents you should "main" for the best performance, so far I am playing Phoenix, Chamber and Kay/o and really enjoying playing them + I love their designs.

Is this an optimal agent pool? Should I add more or play some of these less? Is it good if they all have different roles? Also is at least one of this agents good on every map or is there a map where none of these would he optimal?