well if we look at most of the newcomers added they've all been pretty crazy different, either in style or in actual play. Villager is Phoenix-Wright style 'normal actions that somehow do damagfe', Wii Fit Wii Fits, Megaman is largely ranged play or boss attacks, Rosalina is a stand user, Lil' Mac is a powerhouse with horrible recovery, Greninja is all fast and stealthy, who knows what's going on with the Miis, Palutena's moves are all powerups from Kid Icarus (!) and Pac Man gonna chomp. So if Chrom is in, I don't know that he'd just be sword guy again. Maybe partner mechanic, i dunno.