try to put characters with the same abilities in teams together basically other than that i just try to keep the slowest and fastest squads no more than 50 speed apart which seems to be the best to 3 medal event maps. for example i plan to make an attack debuff team (cherry, oncibride, acacia), dodge/counterattack team (lycoris, saffron, setaria), skill activation rate up team (maple, kale, justicia) etc