I would like a Cy-Bug mount + enemy (So I can have characters like the Turbo/King Candy cy-bug. Hey, it's a longshot but it would be awesome), Cy-Bug Baby, the Scream cans, lightsabers, arc reactors, cherry bombs, space mountain, Gaston's tavern, the Will-o-Wisps, Yzma's potions, the turkey leg weapon, ANY Star Wars spaceship, droids enemy, stormtroopers enemy, ANYTHING based around Gravity Falls, Phineas & Ferb, Wreck-it Ralph, Avengers and Star Wars, Treasure Planet hoverboard, a skateboard (to remake THAT awesome skateboarding game Disney made for the PS2 way back), P&F's time machine, ANY of P&F's inventions and King Candy's cane.
Spoiler: show
I wanted to make a Toy Box where the Cy-Bugs, Onmi-Droids and Stormtroopers would fight to the bitter death and you can join in the fun.