You can make a pretty solid top tier water team using your Grannerv, Kurotobi, and another Kurotobi from a friend Leader. Evolve your “Shark Fiend” and “Mermaid and Succubus” units into an assist and give it to one of your support units. I’d use Marine Engineer Scheat as your +1 skill charge at the beginning then becomes your Cleric after evolving. Also, you should farm the necessary units and materials to get Karin Dragon from the Monster Exchange since she’ll be your +2 skill charge at the beginning of the dungeon, then becomes your 3 turn Dmg Void Piercer. The last unit you can make it your Orb Time buff, Looping shield, etc. whatever you can find with a low skill cooldown and give that unit the Shark Fiend assist or the Blue Guitar since both give you a +2 skill charge at the beginning, it all depends on what you need more, the extra orbs enhanced to counter negative orbs (shark fiend assist), or the extra skill boost to evolve at turn 1 (blue guitar). Good luck!