Ramenman saved him from some thugs and, after learning that he too had lost his family to the Cobra Gang, allowed him to travel with him. Although he behaves childishly and gets in Ramenman's way at times, he is actually quite knowledgeable in martial arts and even occasionally gives Ramenman advice.
- Kaiten Ryūbi Kyaku (回転龍尾脚, Spinning Dragontail Kick)
- Rekka Taiyō Kyaku (烈火太陽脚, Ranged Solar Kick)
- Meidatsu Hōkai Ken (命奪崩壊拳, Life Stealing Crumbling Fist)
- Kirimomi Kyaku (錐揉脚, Spinning Kick)
- Haimen Fūsha (背面風車, Rear Windmill)
- Hyakusen Hyakushō Kyaku (百戦百勝脚, Ever Accurate Kick)
- Hien Senpū Kyaku (飛燕旋風脚, Swallow Whirlwind Kick)
- In Kinnikuman Nisei chapter 47, Shumai appears as one of Ramenman's students.
- A reimagined version of Shumai appears in the Ramen Niang backup story in Kinnikuman Lady.
- He is named after shumai.
- Shumai is referenced in Danganronpa V3: Killing Harmony by Kokichi Oma, Kaito Momota and Tsumugi Shirogane in Chapter 4's Class Trial