Shunned Guy

The Shunned Guy is an off-putting Shy Guy found in the Indigo Underground. It can be located in a small cave branching off from a platforming room next to an upward-moving block. It is seen sucking the colour out of a toad until Mario walks further. It suddenly bends backward unnaturally and spots Mario before moving towards him similar to a 2-Fold Goomba, initiating a battle.

Gallery
https://www.youtube.com/watch?v=3QAgNDVBibQ <- The odd encounter