yo i think hollow ichigo should have a dark combo AAA.
and for a taunt he should have an a dark aura surround him for the entire match.
his B left should be like air slices that you can see but you dont have to be touched with the sword for it to hit you.
his his down B could be like his sword has that dark purple or white haze over it  if white it freezes enemy but no flying in the air when frozen if  purple flame the person is on purple fire.
his dodge should be like lucarios warp attack like agilitize in the direction you press it or just regular telaport
his final smash should be when ichigo with mask  and hollow ichigo smash the players in the air causing dark burns then fazing in and out slashin the numerous amount of times before ending with them merging together and making full hollow and hitting them wit a heavy dark slash.