A game that has the control scheme of a modern day Zelda game, a very carefully designed freerunning type mechanic for traversal, the color palette of a Kirby game, and is focused around collecting different magical swords that give you cool beam attacks and such when you swing them - but the swords don't get phased out, you are expected and to level them up and use your favorite few throughout the game like they're Pokemon (they have a limited magic pool, and it only recharges in your inventory, so you have to swap between a few, but you never permanently lose them). The story would follow anime plot progression of "Start off with stopping bandits, end with you swordfighting God, and every step between the two is a logical offshoot of the last."
...actually, I may use this mechanic for a book at some point that sounds rad as hell.