Number 54's guardian

Number 54's guardian is a character who is one of the guardians protecting "Legendary Numbers" appearing in the Yu-Gi-Oh! ZEXAL anime.

Biography
In hidden Colosseum at Spartan City, Number 54's guardian in Spartan warrior armor protects Number 54: Lion Heart. It battled Alit to keep him from getting the sleeping Number. He also seemed to recognize Alit when he explored colosseum.