A lot of guys I play with don't seem to realize how useful Dark Fusion is on monsters that aren't Evil Heroes. I'm a fan of Bickuribox, and frankly it's one of the more remarkable fusion monsters available for what it fuses from. It might not impress with ATK right off the bat, but put a Malevolent Nuzzler or an Axe of Despair on it and it's something to pay attention to in a quick hurry.