This enemy has a fast attack rate, does massive damage and weakens cats from a range of 800, this combined with the support in the stages that she appears in make her range and damage all the more threatening.
Anti-Red Cats such as Elemental Duelist Cat, Roe Cat and iCat are all extremely helpful when fighting this demon, although Hannya will have to be weakened in order for Elemental Duelist at level 33 to survive a hit, although this will not be a problem with Roe Cat.
A Black variant of Hannya, while also keeping its Red trait. It has more health, lower time between attacks, an Omni Strike pierce, and immune to freeze, but lower damage and has fewer knockbacks. It also knockbacks cat units rather than weaken.