Mayumi has appeared in only one U.S. convention, Anime Expo New York 2002, which took place from August 31, 2002 to September 2, 2002.
Mayumi is a member of an early childhood education research society.
As well as having the star role of Monkey D. Luffy, Mayumi has sang in six character singles in One Piece
Samba Bomber Akuma No Mi (Samba Bomber Devi Fruit)- Devil's fruit song
See Moon see you
Holy Holiday- A Luffy image song
Respect!- 2001 Movie short
Wanted!- A Luffy image song
We are here!- A Luffy image song
Mayumi performed the ending theme song (episodes 13-20) for Sakura Wars and the opening theme to Sakura Wars: OVA 1.
Mayumi is the voice of Babe in the Japanese dub of the English movie, "Babe".
Mayumi's blood type is "A".