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Lyserg Diethel (リゼルグ・ダイゼル, Rizerugu Daizeru) is a fictional British character from the anime and manga series Shaman King. He is an orphaned from a young age, when Asakura Hao killed his parents,when they refused to join him. This in turn makes him seek revenge, and eventually made him participate in the Shaman Fights to kill Hao. He would eventually join the extremist group known as the X-Laws, believing they would help him gain his revenge.

The main antagonist Hao Asakura (Zeke Asakura in the English Dub) killed his parents while he was young and since then he has sought out revenge on Hao.

Lyserg, who was born in London, England, is also a dowser, a person who is able to find a person or persons using his special abilities. Lyserg uses his Crystal Pendulum for dowsing and over souls. He channels his over soul into his dowsing pendulum, allowing it to become a rope dart. His method of fighting with it consists of using high speed attacks that come out too fast for his opponent to react against.

At first, Lyserg joins with Yoh Asakura and the others, but later joins the X-Laws, a group dedicated to destroying Hao. When Lyserg joins them he is unsure about the ways the X-Laws try to eliminate Hao. Though Lyserg holds great hatred for Hao, Yoh's own philosophies and personalities keep him from crossing the line. In the anime, Lyserg abandons his spirit Morphine for an angel spirit called Zeruel, but in the manga they are inseparable. Finally, he rejoins Yoh's team.

Lyserg Diethel has not been a contender in any CBUB matches.