Reiji Arisu

Reiji Arisu (有栖零児 Arisu Reiji) and his partner Xiaomu are the protagonists of the game Namco × Capcom, and they also appear as a playable characters in the games Project X Zone, Super Robot Taisen OG Saga: Endless Frontier and its sequel Super Robot Taisen OG Saga: Endless Frontier EXCEED.

History
When young, Reiji was training to be a member of the secret organization Shinra like his father Shougo Arisu (有栖正護 Arisu Shougo). Ten years ago, in Shibuya, Reiji tried to protect his father from Saya, and he got hit in the head and passed out. When he awoke, the battle was over and his father perished, believing that Saya killed him. The scar in his head pulsates when Saya is close.

Namco × Capcom
Reiji is now a member of Shinra, which investigates disturbances in space and time called "fluxes". He is a no-nonsense, hot-blooded fighter who wields an array of pistols, shotguns, and swords.

Super Robot Taisen OG Saga: Endless Frontier
After saving his world in a series of brutal battles, Reiji and his partner Xiaomu continued to pursue the crime lord Saya when all three were sucked into an unknown flux which deposited them among the worlds in the Endless Frontier.

Project X Zone 3: A wakening of the Trailblazer
Reiji and his parther, Xiaomu travels Townsville, He accepted Leon's Group, because Reiji's Rival, Saya, Dokumezu & Dokugozu join Xanerations' Plan.

Crossover Appearance
Project X Zone 3: War of Infinite Worlds

Reiji Arisu appears as a Pair Unit teaming up with Xiaomu, both playing major roles in the massive crossover game.

Chou Super Robot Wars Æ and M

Reiji and Xiaomu make cameo appearances in attack animations of the auxiliary vessel Dragonturtle Mk. I and later, become co-pilots alongside Isaac Flynn of the Dragonturtle Mk. II.

Project X Zone 3: A wakening of the Trailblazer

Reiji Arisu appears as a Pair Unit teaming up with Xiaomu.