Neku is a character who first appears in Yu-Gi-Oh! Forbidden Memories. He is one of the Heishin's guardians along with Sebek. Neku is suprised to see Sebek defeated after he loses to the prince. Neku then duels and loses to the prince, allowing the prince into Heishin's lair.
In Yu-Gi-Oh! The Falsebound Kingdom, he appears as an enemy Marshal named Necubetos.