Reiji

Reiji (レイジ) is a fictional character of Gundam Build Fighters TV series.

History
Reiji is a mysterious boy who Sei Iori encounters in town. He's overbearing, selfish, quick to anger and lacking in manners. Also Reiji lacks some common sense, which leads him to accidentally steal bread from a shop owner in the mall. Sei covers for the slip up since Reiji does not have money, and in turn is gifted a small pearl along with Reiji's Promisse that he would repay his help if he were to wish anything on that stone.

Latter, when Sei struggles to beat  Sazaki's Gyan, he actually wishes for help on the stone, which led Reiji to appear out of nowhere ant take control of the Build Strike's battle cockpit. He shows amazing piloting and battle skills despite never having interacted with a Gunpla Model or taking place in a Battle, which lead Mr. Ral to assume he was a Newtype (Note:At the time he might have just been comparing his skills to the Newtypes of the Gundam verse).

Having repaid his debt with Sei by protecting the Build Strike from getting taken by Sazaki, Reiji refuses to aid him in winning the Qualification rounds of the Gunpla Battle tournament. He does, however, remains at his home and agrees to assist Sei's mother in the shop and lets Sei keep the Jewel, which the latter had placed on his GP base slot.

He changes his mind after following Sei to school and engaging in battle with Monta Gonda  Tatsuya Yuki barges in the arena and easily defeats a weakened and incomplete Build Strike with his Zaku Amazing. After which he taunts Reiji and Sei into completing the Gundam and avenging their defeat in the Qualifications.

After agreeing to work togheter, Reiji misteriously disappeared in a flash of red light. Sei latter finds him battling in the Shop and forces him to explain how Reiji was able to dissapear out of thin air. At the time, Reiji claimed the existence of a kingdom know as Arian, and that he was the prince of said kingdom, having found his way to Earth among a pile of treasure and decided to stick around after enjoying gunpla. Sei does not believe him, mainly because Reiji portrays himself as a kind and loved prince, but also because there are no known planets, other than Earth, with life. He gives up on finding more about Reiji's past and decides to focus on Gunpla.

Tatsuya Yuki never actually battles them in the tournament, having withdrawn before their battle due to unexplained reasons. This leads Reiji to getting disappointed and almost giving up the game. But after Mr. Ral peeps him up he met Tatsuya who invited him to an exhibition at the school battle dome. Thanks to the battle both of their gundams took massive damage and Reiji and Sei lost the match again, having to finish the Tournament with their spare Gunpla, the Mk II.

Having been victors at the qualification rounds, Reiji went with sei's family, China and Mr. Ral to the beach as part of their winning prize. There, he discovers the sea water is actually salty, something that is true in possibly every beach in Earth, tough Reiji points out he has been to a Beach, but without salty waters. This somehow supports an ongoing theory of Mr. Ral that Reiji might live in a colony (Again, there is no way of telling if Ral was joking or was being serious, tought it is possibly both).

Reiji enter the World Tournament with Sei, where he develops a friendly rival relatioship with Aila Jyrkiäinen  of team Nemesis due to their shared love over food. Neither aware of the other status as competitor in the tournament altought both aknowledge their Gunplas as worthy oponents. Sei and Reiji's improved Star Build Strike draws the attention of Nils Nielsen who had formerly met them in a girls tournament and Luang Dallara, the Thai competitor who seeks out to eliminate them from early in the tournament. He also met Yuki under the new Alias Meijin Kawaguchi.

In the second match survival tournament Reiji and Sai formed an aliance with Mao Yasaka and Ricardo Fellini while attempting to protect Fellini's Wing Gundam from a bunch of competitors whose girlfriends the Italian Competitor had stolen, Ricardo being a player who helped Reiji get familiar with the Gundam Battle controls trought a series of battles in Ral's secret fighting society club.

Their Success at destroying a party of superior number exposes Reiji's face to the CEO of PPSE, Mashita, who correctly associate's Reiji with the prince of Arian the Chairman had met in the past. This causes the CEO to Panic, which in turn made Mashita target Sei and Reiji's Gunpla in order to get them out of the competition before Reiji has a chance to confront Mashita. Reiji, in turn, is apparently unaware of the Identity of the CEO and does not display any desire to seek and confront him.