This glitch was found by aznrainbow99 and it makes a character stuck in a permanent immune phase, where the character is on the Super Star but cannot make contact with the ground. As a result, the character is stuck in the item's invincibility frames but is unable to move. (More testing Needed)
How to perform
1. In any mode with platforms, (The glitch occurred in Jungle Japes) use a super star and aim for slightly off the platform.
2. If the glitch worked correctly, the character should be permanently immune and immobile for the rest of the battle.
Video showing the Glitch