Ms. Madd made her first appearance in the first Mega Man Battle Network game. She first appeared during the event of IceMan.EXE freezing the water in the waterworks, where she pretended to be a worker at Scilab and told Lan Hikari to go home (due to closing time at Scilab). She is later found out by Lan that she was the one blackmailing Dr. Froid into freezing the waterworks system with IceMan and kidnapping Tory Froid; however, despite this, she had already obtained the aqua program the organization needed.
Ms. Madd later reappears in Den City, this time trying to sell a program that can resist malfunction (she and ColorMan cause the malfunctions). However, her plan was ruined by Lan. Madd then attempts to cause the bus that Mayl Sakurai was riding in to crash in retaliation for Lan ruining her plan. Still, her plan was ruined once again and she then attempted to blow up the bus, but Lan and MegaMan defeat her in the end.
Ms. Madd is later seen again near the end of the game along with the other WWW members, getting scolded by Lord Wily.
In this game, Ms. Madd (referred to as Madoi) is a normal contestant that will eventually be beaten by any one of the playable characters.
In the MegaMan NT Warrior anime, Maddy is still a member of the world three alongside Mr. Match, Count Zap, and Yahoot. However, during the course of the series, Maddy eventually becomes an ally and friend of Lan Hikari and MegaMan.EXE alongside her fellow World Three members.
Ms. Madd/ Maddy is tall and slim. She has small black eyes with purple eyeshadow and orange hair tied in big fluffy bunches at the side of her head and a spiky fringe at the front. She wears an orange and white t shirt with ColorMan's logo on the front over a long sleeved maroon shirt, blue, green and purple striped trousers and orange trainers with white laces. She also wears small silver hoop earrings in her ears.
- It was never explained what happened to her in the games. She may have been arrested like Count Zap or changed carrier like Mr. Match.
- Her Japanese surname contains the kanji 色 meaning "color".