I don't have much to contribute to the stage convo, but I second every playable series having at least one stage and throwing in a few miscellaneous stages for franchises that can't make the cut. Maybe give an extra stage or two to some of the bigger series' with multiple iconic locations. I have a stage idea for Jack, and I may come up with something for Adventure Time later.
Jack Stage: The Rave
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I’m aware that this is a less traditional stage for Jack, but personally I think we could stand to think outside the box and go for some of the not so obvious locations for variety’s sake. Samurai Jack has a lot of memorable episodes and action setpieces that would make for some really fun stages, and this was just one of the handful of options I was mulling over. As part of his latest scheme, Aku has taken to brainwashing the youths with his hypnotic
AKUstic music, making them his obedient followers. After learning of an innkeeper's daughter who has become a slave to Aku's rhythm, Jack sets out to find the source of the music and destroy it once and for all. In his search, he stumbles across a rave and learns that the one behind the brainwashing beats is DJ Salvatore, one of Aku's minions.
The stage takes place on, well, the stage of the rave. There's two platforms hanging from wires, which will be raised up and dropped down at different parts of the stage throughout the match. In the foreground you can see the rave members dancing to the beat and swinging their glowsticks, and in the background are two loudspeakers and DJ Salvatore vibing in the background. Partway through the match, Salvatore will fuse together his musical equipment into a mech body and begin briefly destroying parts of the stage, causing lights and other electrical equipment to fall from the sky and damage the players.