King of the Netherworld

The ¨King of the Underworld¨ is the consequently ruler of what´s known as the Underworld.

Mentioned briefly by the Dark Signers leader, Rudger in his rematch against Yusei Fudo. For now not much is known about this character, however only that apparently if the 4 Old Momentum Towers are not sealed before an establish time set by Rudger on the anime it is said that it will be revive.

Mostly this has to do with the Old Momentum acting as the Door to the Underworld, which in order to be closed properly first its respective controllers must be sealed by each one of the 4 Signers.