One of the many, many, many, MANY brilliant yet abandoned IPs Capcom is sitting on and doing nothing with because it doesn't start with "Street" or "Resident."

This is about the closest thing I can imagine to what a 3D Smash Bros. would be. The fighting revolves around battling your opponent in small 3D arenas packed with items and hazards over control of 3 Power Stones that appear on the stage (among other crazy items like swords, bazookas, bombs, etc.) which cause your character to transform into a special powered up version of themselves upon collection of all 3. Also like smash, all items can be turned off, even the Power Stones, and the fighting itself is robust enough that the game is still fun without them. This IS Capcom after all, they made some of the best fighting and action games of all time.

It's alot more fun with items though, running around the stages and chucking boxes and tables and chairs at your opponent to steal their stones is a blast. A Power Stone 3 sure would be nice.