Fighter Nomination:
I really wish we could nominate more than one character for this, because I have so many ideas - Miriam from Bloodstained, Yooka and Laylee, Juan from Guacamelee, Crow from Nefarious... One fighting game archetype that we don't seem to have represented in here is a big beefy grappler type - maybe Peppino or Springtrap could work (I'm not familiar with either game), and I could go with Juan if I wanted a grappler type, but I wanted to get weirder.
Ultra Fishbunjin 3000 (Ittle Dew/Slap City)
A secret boss in Ittle Dew, Ultra Fishbunjin 3000 is a beefed up version of the regular Fishbunjin enemies from a Zelda-like game. He later became playable in Ludosity's crossover Slap City, where he's utterly ridiculous - he runs around making noises like a car, literally flexes on the opponent, throws dumbbells that bounce around the stage wildly, and has a charge punch that can be held for roughly thirty seconds until a spiral galaxy appears around his closed fist and he punches so hard that it makes an explosion. Look up pretty much any Youtuber playing Slap City, and he'll probably be the highlight.
He also appears in Fraymakers, so between that and Slap City, there's lots of potential for what he could do.
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Stages:
Hivory Towers (Yooka-Laylee)
The stage takes place on a floating platform in front of the entrance to Hivory Towers, made up of black and yellow hexagonal platforms similar to the building's entrance. Similar to Zebes in Smash, there's a glowing pit of toxic waste below the stage, which will occasionally rise up to flood the main platform, forcing players onto the smaller platforms, before receding back down to its normal, slightly safer levels.
Characters could appear on the hills behind the stage, such as Capital B (who laughs at any fighter who gets KO'd), Dr. Quack, Trowser, Rextro Sixtyfourus, and Doctor Puzz.
The Owl Express (A Hat In Time)
One of the earlier levels in A Hat In Time, the Owl Express is a movie set where a murder mystery is being filmed. The train is shortened down to three cars - the caboose, the VIP lounge, and the locomotive. Players can fight on the roof or hop down into the train cars to fight, and much like Big Blue, landing on the train tracks is not recommended. The VIP lounge is large, with plenty of platforms, the caboose is medium-sized but piles of luggage make it uneven, and the locomotive is small and doesn't give you much room to maneuver.
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Assist:
Octodad (Octodad: Dadliest Catch)
I know what you're thinking - why on Earth would someone want a perfectly normal father to be summoned as an assist? What could he do? However, Octodad is more capable than you might think. Sure, it might
look like he's randomly flailing around, tripping over banana peels and struggling to even walk in a straight line, but... okay, that's exactly what he's doing. Still, you'd better watch out, because getting smacked by his normal human hands and feet will still hurt, regardless of how clumsy he might be.