Betty Förster is a German theater and voice actress born in Berlin in 1988. Her path to voice acting began with a foundation in musical theater. She studied musical theater at the Hamburg School of Entertainment from 2009 to 2012 and performed in various stage productions, including musicals and open-air theater. In 2016, her career shifted from the stage to the studio, leading her back to Berlin to focus on voice work. Her early, playful experiences voicing her dolls are now realized in her professional career, where she lends her voice to a wide range of characters in film, television, games, and audio dramas.

Förster is a prolific voice in the German dubbing of anime and international series. Among her notable anime roles are those you mentioned. She voices Sheila, a gentle and strong leopard, in the series BEASTARS, a role she has played across multiple episodes in both the first and second seasons. She is also the German voice of Yui Minagawa in the ONA series Calamity of a Zombie Girl. For the series Hi Score Girl, she voices Reiko Toono, having dubbed the character for the original Japanese voice actress Chinatsu Akasaki. In the same database that confirms the Hi Score Girl role, she is also credited with voicing characters in other major anime such as Kaguya-sama: Love is War, Black Clover, Komi Can't Communicate, and JoJo's Bizarre Adventure: Diamond Is Unbreakable.

A recurring theme in her work is voicing characters originally performed by a specific set of Japanese actresses. She has frequently dubbed roles for Chinatsu Akasaki, who voices Reiko Toono in Hi Score Girl, as well as for Aya Uchida and Ari Ozawa. This indicates established working relationships with German dubbing studios that handle these assignments. Her voice work is often part of larger dubbing productions for major platforms and distributors, with BEASTARS being available on Netflix and Calamity of a Zombie Girl distributed by KSM.

Beyond her core anime roles, Förster's notable achievements include a diverse and extensive body of work. Her profile lists voice roles in a wide array of international productions, demonstrating her versatility. She has voiced characters in popular series such as Shameless, SpongeBob SquarePants, Atypical, Shadow and Bone, and The Sandman. Her film work includes roles in major productions like Once Upon a Time in Hollywood, Avengers: Endgame, and Thor: Ragnarok. She is also a trained singer with a Mezzosoprano voice, a skill she utilizes in her performances.