Whacka
Super Mario Bros.
A relatively harmless enemy, the Whacka would only be able to damage players if they happened to be near it when it pops out of the ground. It attacked it drops an edible Whacka Bump, which can be used to heal 50%
This foe rarely appears and is never seen on floating platforms. They can only spawn in areas with solid ground beneath them.
Ultimate Chimera
MOTHER / Earthbound
A very
deadly enemy, the Ultimate Chimera acts much like it did in Brawl, but it works a little bit differently now. Upon seeing a player, it will be dead set on taking a juicy bite of said fighter. A little marker will appear above the fighter's head so you know you've been targeted. The UC is fairly quick as well, so trying to outrun it won't work. You only four options in this situation.
1) Try to get the UC to fall off the stage [It does have multiple small jumps, so try to get up into higher areas or travel through long abysses].
2) Attack an opponent, which will cause the UC to target the person you've essentially marked [A main reason why the marker appears overhead in the first place].
3) Attempt to defeat the UC by attacking the button it's back [No, projectiles don't work. Be mindful that being near the UC will make it automatically turn around and attempt to bite you, so you'll have to be quick!].
4) Just suicide, because you know you can't defeat it [The sad truth for Mega Man].
If you're bitten... Well you probably knows what would happen next. Can appear pretty much everywhere in Smash Run, sometimes in areas you wouldn't expect to see it in! It rarely appears, so seeing one would certainly be an unfortunate surprise.