Jason Todd, operating under the alias Red Hood, allies with Batman in *Batman Ninja*. When Gorilla Grodd’s Quake Engine activates at Arkham Asylum, he is hurled into feudal Japan alongside the Bat-Family. To assimilate into the era, he adopts the guise of a wandering monk, concealing his identity beneath a modified mask resembling a fallen samurai’s woven basket helmet—a design historically linked to shogunate assassins.

Stranded in the past, he spends two years methodically gathering intelligence on the altered timeline and the rise of Gotham’s villains, who now rule as feudal warlords. Charged with tracking the vanished Joker and Harley Quinn after an explosion erases their memories, he uncovers them living as peaceful farmers. Though skeptical, he honors Batman’s directive to leave them undisturbed until exposure to Joker’s toxin reignites their identities.

Red Hood joins the climactic assault against the united warlords, whose mechanized castles fuse into a towering robotic fortress. Post-battle, he aids in securing the defeated foes for transport to modern authorities. His tactical precision and seamless adaptation to feudal warfare—leveraging surveillance, firearms, and close combat—reflect his core expertise as a strategist and fighter.

The narrative confines his portrayal to events within *Batman Ninja*, without elaboration on expanded lore or external media.