So each of the announced fighters have their own stage. Spring Man has the generic boxing rink. Ribbon Girl has a concert hall dance stage. Ninjara has a ninja temple with sakura tree. Mechana has a construction site. Master Mummy has a spooky graveyard. Min Min has the giant ramen bowl.



A seventh stage is shown, corresponding to one of the other characters. This character clearly has the DNA double helix as arms. My bet is on the white character being a Mewtwo-like genetically engineered clone. We can see the body of this character (or at least his minions) in giant test chambers on this stage.



Other stuff I noticed: Each of the characters has their own icon. This is often shown on their stage, but I didn't spot all of them. There's also logos representing the brands of different equipment suppliers. The Arms League has its own logo, looking kind of like a letter A with a globe in the middle and lightning coming out of the bottom. The fans in the audience members dress up like the characters you're playing as in Kirby-like costumes.



Silly guesses: The green sex robot is really a humanoid wearing a welding mask, with fire arms. The Luchadora has spandex arms. The yellow robot has braided extension cord arms.