The Interdimensional Kinetic Entity, or Ike, is a creature Professor Quadwrangle discovered as part of his experiments in dimensional shifting. His relationship with the Professor seems to be somewhere between traveling companion and pet.
Initially shy around the player, only peeking around corners before disappearing, over the course of Quantum Conundrum he grows more comfortable and even helps the player by bringing him IDS Batteries.
The Professor lists his dietary requirements as steel ball bearings, asparagus, uranium-235, and whatever he's in the mood for. He seems to be able to eat anything ranging from parts of the bathroom to stamps.
Ike's species has the ability to observe more than one dimension at the same time.
The player can obtain the Big Meanie achivement by knocking over Ike with an object.