What if I told you the key to beating Batsu quickly is assigning additional skills to Soh rather than the villagers. Batsu traps the villagers so they’re often less useful during that fight. Don’t spread your points among different villager roles, concentrate on one useful role and upgrade Soh instead. They have an upgrade that gives them additional charms, and you can have three specials all charged up for the fight. Using the ones that do massive damage up-front allows Soh to quickly dispatch Batsu. So points are better spent on them rather than the villager.
Also, a key general strategy is to reallocate points to your villagers per level so you can reserve points for Soh. Always be redistributing based on which units you need and reset any villager roles you’re not assigning to zero to reclaim points for others.