Marius Julius Seiryu Schmich (born March 30, 2000), known professionally as , is a former Japanese singer, songwriter, actor and television personality. He was a member of the boy band Sexy Zone.
Marius Julius Seiryu Schmich was born on March 30, 2000, in Heidelberg, Baden-Württemberg, Germany. His father is German and his mother is Eri Yo, a former Takarazuka Revue actress known by the stage name Akira Yo who is a Japanese national of Taiwanese descent. He has two older siblings, Marilena and Max.
Yo is trilingual; he speaks Japanese, English, and German.
Yo joined Johnny & Associates in January 2011 and debuted together with Kento Nakajima, Fuma Kikuchi, Shori Sato, and So Matsushima as the youngest member of idol group Sexy Zone in November 2011. He was the youngest person to ever debut with the Johnnys & Associates (Age 11 when debuted). In 2012, he debuted as an actor in the Japanese drama Kodomo Keisatsu.
On May 5, 2014, during "Sexy Zone Spring Tour Sexy Second Concert" in Yokohama Arena, it was announced that Sexy Zone's spin-off units, Sexy Boyz and Sexy Show, would be established, with Yo and Matsushima as the respective leaders. The two other members of Sexy Boyz were Yuta Jinguji and Genki Iwahashi, while Sexy Show included of Kaito Matsukura and Genta Matsuda. Yo continued to work as a member of both Sexy Zone and Sexy Boyz. In 2015 for their tenth single, Marius became a part of Sexy Zone again, disbanding Sexy Boyz.
On December 2, 2020, it was announced that Marius would go on hiatus due to poor health.
On December 27, 2022, it was announced that Marius would be graduating from Sexy Zone and retiring from the entertainment industry after December 31, 2022.
On December 31, 2022, during Johnny & Associates's annual countdown event "Johnny's Countdown 2022-2023", he performed with Sexy Zone for the final time and retired from the entertainment industry.
Since leaving the entertainment industry, Yo attended and graduated from IE University in 2024 with a Bachelor's Degree in philosophy, politics, law, and economics.
For Sexy Zone-related appearances, see Sexy Zone.