4, & they all share the same animations. You'd need to make multiple sets of animations for the ARMS characters to avoid homogenizing them. And if they couldn't even do Garou Terry, I wouldn't get your hopes up for a composite slot.
Not if they modify the existing high quality animations from an existing switch game.
Hero and Terry had to all be made from scratch
The wouldn't be the case with the ARMS people, and even then, in the source game only Ribbion girl can double jump and she has a specific animation for that.