Shion Wakayama is a Japanese voice actor born on February 10, 1998, in Chiba Prefecture. She is affiliated with the Himawari Theatre Group, a talent agency she joined at the age of three. Her career in entertainment began as a child actor in 2002, with her first role in the television drama Toshii to Matsu. She transitioned into voice acting in 2006, voicing a younger version of a character in the anime series Red Garden.

A significant turning point in Wakayama's career came in 2019 when she was cast in her first leading anime role as Aoi Aioi in the original animated film Her Blue Sky. This opportunity helped establish her presence in the voice acting industry. The following year, she began to gain wider recognition with a series of prominent roles, including Yume Minami in SSSS.Dynazenon, Cosette Schneider, also known as Destiny, in takt op. Destiny, and Sawa Echizen in Farewell, My Dear Cramer and its film adaptation.

Wakayama's career continued to ascend in 2022 with several high-profile performances. She voiced Mai Kawai in the police comedy Police in a Pod and Takina Inoue in the critically and popularly acclaimed original anime Lycoris Recoil. Her role as the serious and efficient Takina Inoue further solidified her reputation for playing characters with a more reserved and understated demeanor. That same year, she also voiced Tomono Kojō in Akebi's Sailor Uniform and Henao Jazz in Mobile Suit Gundam: The Witch from Mercury.

In 2023, Wakayama's work was honored when she received the Best New Actor Award at the 17th Seiyu Awards, a prestigious recognition of her talent and growing influence in the industry. Her filmography continued to expand with roles such as Ai Mie in The Girl I Like Forgot Her Glasses and Izumi Tokutomi in Pon no Michi.

A major milestone in her career arrived in 2024 with her portrayal of Momo Ayase in the immensely popular anime adaptation of Dandadan. This role represented a significant departure from her previous work, requiring her to voice a character defined by high energy, loud expressions, and rapid-fire dialogue. Wakayama has openly discussed the physical demands of the role, noting that she had to push herself to new limits, often leading to headaches from the effort required to maintain the character's intense vocal performance. Despite the challenges, she found the experience rewarding and a valuable opportunity for growth as a performer. Other notable roles from 2024 include Lemon Yakishio in Too Many Losing Heroines! and Asahi Amagami in Tying the Knot with an Amagami Sister.

Beyond anime, Wakayama has also lent her voice to various video games. Her game credits include roles in Azur Lane, Ys X: Nordics, Magia Record, and the popular titles Honkai: Star Rail as Yunli and Zenless Zone Zero as Ellen Joe. She has also performed dubbing work for foreign content, such as providing the Japanese voice for Thumper's Sister in the animated film Bambi II. Throughout her filmography, Wakayama has demonstrated a versatile range, moving seamlessly from quiet and stoic characters to bold and energetic leads, establishing herself as a prominent and respected voice actor of her generation.