Cape Mario

Cape Mario is a form of Mario in Super Mario World. It can be obtained when Mario has a cape by getting a feather out of a ? Block. It can allow Mario to fly through worlds.

Baby Mario uses this form in Super Mario World 2: Yoshi's Island where he becomes invincible.

Luigi can also get this form.

Also, in Super Smash Bros. Melee, Mario can use his cape to attack.