According to the official timeline, the game takes place directly after the events of Mega Man 8, but there are those who doubt the game's canonity. It is a continuation of the gameplay found in Mega Man: The Power Battle. Both games were ported to the Neo Geo Pocket Color in Japan under the name Rockman: Battle and Fighters, to the PlayStation 2 in Japan on one disc under the name Rockman Power Battle Fighters, and then again for the PS2 and the Gamecube as part of the Mega Man Anniversary Collection in 2004.
- Mega Man
- Proto Man
- Dr. Wily
- Dr. Light
- Cut Man
- Quick Man
- Elec Man
- Guts Man
- Yellow Devil
- Air Man
- Heat Man
- Pharaoh Man
- Mad Grinder
- Shade Man
- Shadow Man
- Each of the four playable characters (Mega Man, Proto Man, Bass and Duo) has their own ending once the game is cleared. In Bass's ending, Wily demands to know why Bass destroyed his robots. Bass tells him that only he can defeat Mega Man, and will not accept any other robot doing so, and taunts Wily by saying he must've created Bass "by accident". Wily reveals that this statement is not far from the truth, and that he created Bass after he had accidentally discovered a brand new power source (dubbed "Bassnium"). Wily then tells Bass that his new unfinished robot will outpower Bass, and the game shows a silhoutte of Zero. Bass insults the robot, and says it will never be as strong as him.
- One of Cut Man's attacks resembles the Yashichi item.
Game Design: Ohko.
Programmer: Teruaki Hirokado, Pon, You!
Character Design: Shinji Sakashita, S.Yamashita, SHinya.M, "BA-JI ga SUKI" Runta, Dja
Scroll Design: Kisabon, Buchi, Koichi Takeda, Inoyan
Sound Effect: Moe.T
Music: Yuki, Hideki OK, Yuko Kadota, Masato Koda, Tatsuro-, SYUN Nishigaki, SETSUO Yamamoto
Voice Actor: Hekiru Shiina, Jin Yamanoi, Koji Tobe, Takashi Nagasako, Takko Ishimori
Producer: Yoshimi Ohnishi
General Producer: Noritaka Funamizu
Special Thanks: Shoei, Sakomizu, Goidanokei, Inafking, Masako Honma, Hayato Kaji, Hideki Ishikawa, Hiroki Kato, Hero Hero, Saki, Chiaki.S, Tokuko, Mr. Shiraiwa, Matt Taylor, Erik Suzuki, Jesus Rodoriguez Bueno, Harumi Yamashita, and Capcom All Staff