- "I hope you won't forget me when you go to Junior High! ... You'll always be my students!!"
- —Ms. Mari, Mega Man Battle Network 6
Ms. Mari, known as Mariko Ozono (大園まり子先生 Ōzono Mariko-sensei) in Japan, is a character from the Mega Man Battle Network series. She is a school teacher in the anime and games. She doesn't have a NetNavi in the anime, but uses a NormalNavi in the games. She has a twin sister named Ms. Yuri who is identical to her and some mistake one for the other.
Ms. Mari is a supporting character in the Mega Man Battle Network series. She is a teacher at the ACDC Elementary School where she teaches Virus Busting. From Mega Man Battle Network 4 to the end of the series, the school and Ms. Mari herself no longer appeared in the games, as ACDC Town was redesigned, omitting the school as a visitable location, appearing only in a few scenes. She is a dedicated teacher who gives the class lessons on virus busting and frequents the staff room even on weekends and after-hours. She also emails her class any information she has forgotten to mention.
In episode 43 of MegaMan NT Warrior Axess, Ms. Mari reveals that during childhood, she lost her sister as a result of a unique plane incident. It occurred whilst her family decided to move to a new house, everything was ready but Ms. Mari developed a fever, which caused her mother to stay behind and take care of her. Even so, her father and sister went ahead and boarded the plane, which collided with a falling meteorite whilst airborne over the ocean. No sign of the plane was ever found, which lead Ms. Mari to believe that the familiar woman she keeps seeing, is not her sister. Ultimately, she is properly united with Ms. Yuri during Rockman.EXE Stream.
Additionally, Ms. Mari acts as chaperon to Lan Hikari and his friends on a few adventures and usually ends up caught in the thick of a situation. Also in a couple of episodes, Ms. Mari and Tory Froid are found showing their enthusiasm for hot springs, particularly the history behind them. Furthermore, early on Ms. Mari becomes the love interest for Higsby and Masa, who are constantly fighting for her heart. In the end, Ms. Mari admits that she loves Commander Beef, who is in fact the alter-ego of Masa.
- According to Ms. Yuri, Ms. Mari's measurements are 33-22-33, which is one of the questions of the quiz in the Power Plant. As Yuri and Mari are twins, they probably have the same measurements.
- Ms. Mari frequently visits Miyu's shop to gain fortune-telling insight on love.
- In Mega Man Battle Network, Ms. Mari says "You lost? That won't do..." if MegaMan gets deleted during the tutorial.