Shampuru are reborn monsters that take the shape of bunny-like creatures whenever Chou-Chou peonifies them, with each kind taking on its own unique appearance. They are separated into 7 different categories and serve two main purposes in the game.
As you collect them, usually as rewards for getting 100/300% Planet Energy on worlds, as well as from enemies, they will bump up the Charm levels for Syrma's forms. In addition to that, gaining Shampurus also increase the stats of G-Castle for its battle.