I guess I'm judging this on how boring they are to play for me, but that's Joker. I really like a lot of how the DLC characters play, notably Terry, Byleth, Sephiroth, Piranha Plant, and Pyra/Mythra. Hero's pretty fun, though I haven't given him much of a chance. Minmin didn't click for me quite right, but she's still rather unique. Steve's the one I play the least, but I wouldn't call him boring. Banjo and Joker are kind of standard, but I'd rank Banjo as less boring between the two.