gotta love the disparity of aerial hitboxes in DOA, some characters take to the freakin' skies but you can still hit them with throws and lows somehow (Kula, Ryu, Nyo) while others go airborne and their hitboxes just disappear into the void (Phase, Hayate, Ayane, Lisa) :/
Hard style gives you access to an exclusive move that varies from character to character, said move can improve your zoning capabilities, give you an extra mix up option, or can be used for better pressure