For me I think...probably. I wouldn't mind seeing combatants returning as long as they appear two times. Two appearance of the character is enough by the way and I think less using returning combatants would be cool.

I highly suggest you do, since there are so many great ideas for a combatant, but do not do it the way CFC does it. They execute it so lazily to the point some episodes are basically unresearched, since two combatants have been studied before.

What TheNekrozOfMokey said.

Only slightly more often than Death Battle does.

j