If Ranmaru chooses to slay his mentor, Mitsuhide reveals that he betrayed Nobunaga due to him being envious of Nobunaga's power. Entrusting his pupil to continue believing in their lord in his place, Mitsuhide dies in Ranmaru's arms. Though in anguish for losing his mentor and hating the ugliness of war, Ranmaru continues to fight to honor Mitsuhide's wishes. When assassins threaten Nobunaga's rise to power, he hunts them down in Azuchi Castle and slays them. Reaching the top floor, Ranmaru draws his blade against Nobunaga and questions if his lord will bear the burden of the souls he had killed for him. Nobunaga promises he will only if Ranmaru continues to be by his side.
Sparing Mitsuhide at Anegawa will instead have his mentor retreat to Gifu Castle. Ranmaru, wanting to hear his mentor's reasons for betrayal before Nobunaga unites the land, infiltrates the castle by himself to meet Mitsuhide. Slaying Magoichi and Hanzō, he also routs Kunoichi and Keiji while on his way towards his mentor. Mitsuhide explains that the land is better without Nobunaga and asks his pupil to join him. Ranmaru stays true to his belief for Nobunaga and strikes Mitsuhide down. Before his mentor dies, Ranmaru tries to explain that he still likes and admires his mentor. Mitsuhide passes away while uttering his wish to someday meet his pupil again, which Ranmaru tearfully swears to fulfill.
Ranmaru is a hidden character for Samurai Warriors 2 that can be unlocked by doing the first two "Ranmaru's Request" and "Mitsuhide's Request" jobs in Survival Mode. Like Okuni, he doesn't have a personal Story Mode, and his past history with Mitsuhide is abandoned. However, in Survival Mode, he stars in a special request scenario. He asks the player to help him investigate the nature of Nobunaga's assassin. He wonders if Mitsuhide truly killed their lord. If the player continues to follow these chain of stories, Mitsuhide is falsely accused of the crime due to a look alike set up by Ieyasu. The real Nobunaga is also unharmed since the assailants only killed his body double. Ranmaru and Keiji punish Ieyasu together.
During other characters' scenarios in the game, he is usually found trying to avenge his father's death while facing the Azai forces or defending Nobunaga in various campaigns. He also humorously appears in the beauty competition for No and Oichi's dream stages where he intends to stop the two girls' fight and to "tell Nobunaga" on both of them.
Again without a personal story in the third title, Ranmaru continues to be seen in Nobunaga's ranks during Odani Castle, Nagashino, and Kizugawaguchi. He expresses his concern with Mitsuhide's friendship with Motochika, not completely trusting the latter. During Honnōji, he tries to keep the Akechi army at bay in the north and pleads his lord to escape through the southern exit. He will also inform the players' original character of the situation during the Sengoku History mode. If his life depletes during the battle, he will die wishing for his lord's safety.
Super Smash Sisters Role
Ranmaru Mori is an NPC in SSS. He uses his long sword and some officers get confused if he is a girl. In some cutscenes, Ranmaru is unfazed at the sight of girls fondling each other.