A mod for Super Mario 64
Isabelle 64 is a ROM hack/mod of Super Mario 64 starring Isabelle from Animal Crossing: New Leaf. Isabelle has a double jump, which diferentiates her from Mario and makes platforming easier, and there are graphical differences to match the Animal Crossing presentation (Stars are now Golden Leafs, for example).
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I appreciate the different movement options and the unique outfit edit system alongside some graphical changes, but I still don't think this justifies her being in Smash Bros so I'm removing half star for that.