He is one of two top thugs in an underground gang along with Rikuo.

The story takes place in the near future in a city called Heartland. Tsukumo Yuma is a young duelist who strives to become the Duel Monsters champion, despite being an amateur. One day, during a duel with a school bully, a mysterious spirit called Astral appears before Yuma, and helps him to win. Astral then explains to Yuma that he is searching for his lost memories, which have been transformed into 99 "Xyz Monster" cards called "Numbers" and have been scattered across the globe. The "Numbers" have the ability to possess the duelists who own them and bring out their darkest desires. In order to recover his memories, and collect the "Numbers" cards, Astral teams up with Yuma.

[Twitter](https://twitter.com/samriegel)

Samuel Brent Oscar Riegel is a voice actor, writer and director who appears in many television cartoons, anime, and video games. He began as a child actor in theater in Virginia, and moved to New York City to perform in Broadway and off-Broadway shows. In 1994, he graduated from the Professional Children's School on the Upper West Side of Manhattan, New York City. After graduating from the University of Virginia in Charlottesville, VA, he returned to New York to begin his voice acting career. He now resides in Los Angeles, CA.  

He is the older brother of [Eden Riegel ](https://anilist.co/staff/107937/Eden-Riegel) and the younger brother of Tatiana Riegel.  He was in New York City on September 11, 2001, and he recorded the attacks on the World Trade Center with his video camera.  He is best known for his role of Donatello from Teenage Mutant Ninja Turtles (2003 series).

Kaio