Sluggy the Unshaven
From the Super Mario Wiki
Sluggy the Unshaven is a massive Sluggy found in Super Mario World 2: Yoshi's Island. He is a mid-boss encountered in the World 5 fort. He's a see-through slug with a face, hair in various places and a visible (and equally hairy) heart. To defeat him, the Yellow Yoshi has to throw Eggs at his heart, pushing through his gelatinous skin. He was originally a tiny, nontransparent version of himself, until Kamek used his magic on him.
In Sluggy's open-air room is an Egg-Plant. However, it's at the very edge of the room. Once Yoshi has collected enough eggs, the player must lob eggs at the slug's skin. Every time an egg hits the skin, the skin will be pushed back and the egg will bounce off. Yoshi can then pick up the egg and lob it again. Once the skin is pushed back enough, Yoshi can shoot Sluggy's heart. Once it takes enough hits, the heart will pop out, and Sluggy slides off the stage.
He makes a small cameo appearance in the Yoshi's Island DS intro.
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