for water main, put yagura, mei and sasori hundred puppets

yagura should be position 1, then sasori then main then mei

talents, kyushoku deer, and water trumpet, water enhancement, water whip, shark bomb jutsu, and poison tai

The sasori is replaceable, but mei will buff him and he will summon puppets which will cover your units

most of your combos come from triggered at Blank combo, so ull do damage to multiple units. yagura has a high chance of low float, and 7 combo so he'll start the combo.

im water main to, my team is darui,yagura,suigetsu. My suigetsu is 5 star and fully breakthrough, hes not good till then so i dont recommend him on you team

you could replace sasori for Ao, hes a good buff, then your talents would be the same only you wont combo as well.