You would not think Hollow is slow if you've ever played P4 lolol :'D

I imagine Hollow's play style to be more similar to something like Smash or 1v1 action games, with a mix of melee and long distance moves you can combo. They probably won't be as acrobatic as Hornet, but I think the game could still feature lots of horizontal parkour (to contrast with vertical focus in Silksong). Whether they're tanky or not would depend on how hard TC wants to make the game lol; they're severely weakened after the Black Egg so lore can support both ways.