Do you think a platform fighter MUGEN should be 2D or 3D? 2D has an easier time with importing characters from other games 1:1 as well as being a lower barrier to entry, but, (if there are already prebuilt characters included) 3D would have an easier time just getting the characters in the game due to model swaps as well as not needing to do as much work if you know 3D animation.
Steals the Spotlight
Cow
Comes Home
Dolphin
Makes a Splash