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
Reiji makes an appearance in Project X Zone. He is a playable character with his partner Xiaomu.

Project X Zone 2: Brave New World
Reiji have his main role once more, after destroying Ouma, Reiji and Xiaomu got invited once again to Demitri's castle where this time he and Xiaomu got married.

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.

Project X Zone Appearances
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.

Project X Zone 3: Sacred Destinies

Reiji appears as the main protagonist.

Project X Zone III (RedTheHedgehog140)

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

Project X Zone 3: The New Legend

Reiji appears as the main protagonist.

Project X Zone 3: A wakening of the Trailblazer

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

Project X Zone 3 (TenchiMuyoFan97)

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

Project X Zone 3: The Azure Eclipse

Reiji appears as a playable team unit with Xiaomu. Both are first introduced at the end of the game's first arc, providing support for the TAG Trinity and their allies. According to the duo, Shinra's been monitoring Tokyo for anomalies when the Azure Eclipse struck. He and Xiaomu were dislocated to the Canadian city of Maplepoint Gardens after a strong space rift sucked them in. The two decide to provide further aid to Union 10's forces given the similar roles they share with Shinra... and to play some local multiplayer games with Glas in Xiaomu's case.

Project X Zone 4: Fate at Hands

Reiji appears as the main protagonist.

Project X Zone: Fight For The Future 20XX

Reiji is one of the characters from Namco side.

Project X Zone: The Fighter

Reiji is one of the characters from Namco side.

Crossover Appearances
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.

Super Smash Bros Row

Reiji is one of the Third Party characters of the game.

Just Dance: Anime Dance Tour

Reiji appears dancing at two song: Brave New World and All The World's Stage.