Gelatin

Gelatin is a cube- or rectangle-shaped obstacle that rebounds most Pikmin thrown at it towards or away from the direction the Pikmin was thrown, depending on the direction of the throw. Because of its rubbery nature, it can be used to reach new locations. Gelatin can normally only be destroyed through extreme blunt force such as that exerted by large objects in motion, but typically not explosions or exposure to other hazards. Gelatin may have objects, enemies, or even Pikmin suspended within, and may inherit the supernatural characteristics of enemies such as the Waterwraith.

=In fanon games=

In Pikmin: Sinister Incinerator
Gelatin is an obstacle in Pikmin: Sinister Incinerator that can be made vulnerable to attack by having Purple Pikmin pound on it or the ground around it, which will cause it to temporarily turn a dark shade of purple and allow it to be beaten to pieces. Gelatin can be best described as a pale, transparent substance that resembles water. It is what makes up the main body of the Waterwraith, explaining why Purple Pikmin are required to destroy it. Pikmin and leaders that touch gelatin will bounce off of it and be thrown back but suffer no other effects from contact. It can be seen by itself or infused into other obstacles, and may also be of different shapes, such as rectangles or spheres. Spheres of gelatin often fall from above in certain areas, where they bounce for some time before finally settling.