(Thanks, Speedy1997 for the easy-to-read formatting of your strategy.)

One I like to use is:

Characters
Fuguki, Chojuro, Haku [Edo], Water Main

Skills

Mystery - Super Shark Bomb or Regen Heal
Standard - Healing or Whip (Shark Bomb + Healing just so you have a bit of regen per round OR Regen Heal + Whip so that if everyone else has been Paralyzed or Immobilized, you can heal them and then try to re-trigger a potential combo with Whip)
Chase Attack - Dissection Blade
Passive 1 - Water Enhancement
Passive 2 - Poison or Water Clone (Fuguki's mystery hits everyone, so the more poison the better! But if you're facing a Kurenai or Fire Main, it's better to be safe than sorry and just switch to Water Clone so you don't get Poisoned yourself UNLESS you got ninjas besides Water Main that can heal those debuffs)
Summon - Monkey King