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Our group usually groans whenever my younger brother brings out one of his custom built villains, or worse, an entire team.
Here is a memorable one: Foxhole. You only ever see the head and shoulders of this teleporting, mercenary villain, because his always inside his foxhole (filled with his entire arsenal) that can spring up out of any flat surface. Truly insidious. I once had a brick, M.O.D. (that's Method Of Destruction) jump into the foxhole with him to attack him, and Foxhole just teleported away, without M.O.D. of course! She popped up into the air after taking a load of damage. Was a bummer, really. The guy is a sniper and a damn dangerous one too.