Tuxedo Mask
Most of Sailor Moon's transformations and final victories come as a result of her and Tuxedo Mask cooperating together. In the final battle against the Dark Kingdom, Queen Metaria absorbs Sailor Moon and Tuxedo Mask into her body. However, they succeed in combining their powers through the Silver Crystal and destroy Queen Metalia from within. Tuxedo Mask also combines his power into Super Sailor Moon's last item with the rest of the Guardians using the Golden Crystal. In the Infinity story arc he combines his powers with Sailor Moon to create the next scepter. The episode in which this happens is The Rod of Love is born: Usagi's new transformation.