I'd hate to be that guy, but...I never really grew up with Super Mario World, so I don't really have that same, miraculous, wonderment some people have to it. I also hadn't played much of it within the last 5-10 years, so I can't say I really know much of what the Cape Feather actually DOES, except it's similair to the Tanuki Leaf. So...I'm gonna go with Tanuki Leaf, if only since I find Tanuki Mario adorable. As well as Kitsune Luigi. And Tanuki Fox, Tanuki Lucario, Tanuki Falco, Tanuki Goomba, Tanuki Bowser, Tanuki....Okay I think I drove my point hom., I love the tanuki aesthetic, and its Smash implementation.