Mayumi Shō is a former Japanese voice actress born on February 5, 1965, in Tokyo. She began her career in 1984 and was active in the industry until approximately 2007. Shō was formerly affiliated with the talent management firm Aoni Production. She is married to fellow voice actor Keiichi Nanba. In her later career, she transitioned to a role as a director at Kekke Corporation.

Shō's career is marked by a wide range of roles in television anime, original video animations (OVAs), and video games throughout the 1980s and 1990s. One of her most recognized performances is as the first voice of Chi-Chi in the long-running franchise, beginning with the original Dragon Ball in 1986 and continuing into Dragon Ball Z. Another significant early role was Ikuko Otonashi in the classic romantic comedy series Maison Ikkoku, also from 1986. Her television work also included roles such as Beth March in Ai no Wakakusa Monogatari (1987), Mary Waverley in Lady!! (1987-1988), and Miyoko Nonoka in Kiteretsu Daihyakka (1988). She continued to take on supporting roles in later years, appearing in series like The Kindaichi Case Files (1998), Konjiki no Gash Bell!! (2003), Futari wa Pretty Cure (2004), Welcome to the N.H.K. (2006), and Love Com (2007).

In addition to her television work, Shō was a prominent voice in the OVA format during the late 1980s and early 1990s, a period of significant growth for original animated videos. She played leading roles in several influential and cult-classic OVAs. These included her role as Nagisa Kanō in the 1985 sci-fi series Fight! Iczer-One. She also voiced Mai Yumekano in the cyberpunk classic Megazone 23 (1985), Mia Alice in Dangaioh (1987), and Hitomi in the 1988 adaptation of the manga Appleseed. Her filmography from this era also includes many of the titles mentioned in the initial query, such as Baby Wild Boar in Katte ni Shirokuma, Lyse Morn in Daimaju Gekito Hagane no Oni, and Yoriko Shinagawa in the 1988 war film Raining Fire (Hi no Ame ga Furu). She also voiced Misao Kaizu in Aoki Honoo.

Shō was also active in voice work for video games. She provided voices for characters in games such as Golden Axe (1989), Ys I & II (1989), and Final Zone II (1990). Her connection to the Super Real Mahjong franchise, as noted in the query, is through the 1990 OVA Super Real Mahjong: Kasumi Miki Shouko no Hajimemashite, an anime based on characters from the Super Real Mahjong 2 arcade game. She also reprised her role as Chi-Chi for the Dragon Ball Z: Budokai video game in 2002. Her work in dubbing foreign films includes providing the Japanese voice for the Childlike Empress in The NeverEnding Story.