Aria von Reiji Asuna (アリーア・フォン・レイジ・アスナ, Arīa fon Reiji Asuna?), simply known as Reiji (レイジ, Reiji?), is a character introduced in Gundam Build Fighters and one of the two protagonists of that anime.

From Gundam Build Fighters

Hiroto is a 17 year-old boy attending a high school in a seaside city. He has a lot of experience in Gunpla Battle Nexus Online and is a great Gunpla builder and fighter. Recently, he's become a mercenary and searching for someone that went missing in GBN a long time ago. Hiroto is disinterested in joining any force until the BUILD DiVERS is formed by accident.[1]

From Gundam Build Divers Re:RISE

Seria Urutsuki (ウルツキ・セリア, Urutsuki Seria?), is a character in Gundam Build Metaverse. She is also the Gunpla battler known as Mask Lady (マスクレディー, Masuku Redī?), but tries to keep this a secret.

From Gundam Build Metaverse

May (メイ, Mei?) is a character in the anime Gundam Build Divers Re:RISE. She is the pilot of the JMA0530-MAY Wodom Pod and HER-SELF Mobile Doll May.

From Gundam Build Divers: Re:RISE

The human that proclaims himself as the "Strongest Monster"

From One Punch Man

Kazami Torimachi (トリマチ・カザミ?) is a character in the anime Gundam Build Divers Re:RISE. He is the builder and pilot of the ZGMF-X19AK Gundam Justice Knight and the GAT-X303K Gundam Aegis Knight

Sarah (サラ, Sara?) is a character that appears in the Gundam Build Divers television series.

From Gundam Build Divers

Freddie (フレディ, Furedi?) is a character in the Gundam Build Divers Re:RISE television series.

Kyoya Kisugi (キスギ・キョゥヤ, Kisugi Kyōya?), also known as Kyoya Kujo (クジョウ・キョゥヤ, Kujō Kyōya?), is a character that appears in the Gundam Build Divers television series and Gundam Build Divers Prologue ONA. The captain of Avalon, he is the builder and pilot of the AGE-IIMG Gundam AGEII Magnum and AGE-IIMG-SV Gundam AGEII Magnum SV ver.. He later returns in Gundam Build Divers Re:RISE piloting the AGE-TRYMAG Gundam TRY AGE Magnum.

Yukio Hidaka (ヒダカ・ユキオ, Hidaka Yukio?, commonly called Yukki) is a character that appears in the Gundam Build Divers television series. He is the builder and pilot of the GM III Beam Master and the Jegan Blast Master.

Riku Mikami (ミカミ・リク, Mikami Riku?, commonly called Riku) is the main protagonist of Gundam Build Divers and also appears in Gundam Build Divers Re:RISE. He is the builder and pilot of the Gundam 00 Diver, Gundam 00 Diver Ace, Gundam 00 Sky, and the Gundam 00 Sky Moebius

Hinata Mukai (ムカイ・ヒナタ, Mukai Hinata?) is a character in the Gundam Build Divers Re:RISE television series.

Ruck Arge (リュック・アルジェ, Ryukku Aruje?), also known as Shahryar (シャフリヤール, Shafuriyāru?, commonly called Shahry), is a character who appears in the Gundam Build Divers television series. He is the builder and pilot of the GN-1001N Seravee Gundam Scheherazade.

A (Retired) professional boxer from the Kamogawa Boxing Gym.  

From Hajime No Ippo: The Fighting

Sei Iori (イオリ・セイ, Iori Sei?) is one of the two main protagonists of Gundam Build Fighters. Although his skills in Gunpla building are exceptional, Sei's Gunpla Battle piloting skills were lacking until they gradually improved over the course of the series to the point where he was able to hold his own against Reiji. He is the builder of the GAT-X105B Build Strike Gundam and the SB-011 Star Burning Gundam.

Rio Hojo (ホウジョウ・リオ, Houjou Rio?), is a character in Gundam Build Metaverse.

Nanami Nanase (ナナセ・ナナミ? aka Nami in GBN) is a supporting character from Gundam Build Divers. An employee at the Gunpla store inside The Gundam Base Tokyo, she lets her friends, Riku Mikami and Yukio Hidaka, experience the Gunpla Battle Nexus Online for themselves for the first time [1].

Mikazuki Augus (三日月・オーガス, Mikadzuki Ōgasu?, commonly called Mika) is the main protagonist of the Mobile Suit Gundam IRON-BLOODED ORPHANS television series. A member of Tekkadan and former member of the third group of Chryse Guard Security, he piloted the ASW-G-08 Gundam Barbatos, ASW-G-08 Gundam Barbatos Lupus, and later ASW-G-08 Gundam Barbatos Lupus Rex in the build-up to the McGillis Fareed Incident. Mika earned the nickname The Devil of Tekkadan (鉄華団の悪魔, Tekkadan no Akuma?)

From Mobile Suit Gundam: Iron-Blooded Orphans

Maiya (マイヤ?) is a character in the Gundam Build Divers Re:RISE television series.

Patrick Alexandre Leonard Arge (パトリック・アレクサンドル・レオナール・アルジェ?), also known as Parviz (パルヴィーズ, Paruvūīzu?), is a character in the anime Gundam Build Divers Re:RISE. He is the builder and pilot of the Valkylander.

Momoka Yashiro (ヤシロ・モモカ, Yashiro Momoka?, commonly called Momo) is a character that appears in the Gundam Build Divers television series. She is the builder and pilot of the PEN-01M Momokapool.

Eve (イヴ, Ivi?) is a character in the anime Gundam Build Divers Re:RISE.

Koichi Nanase (ナナセ・コーイチ?) (aka KO-1 in GBN) is a character from Gundam Build Divers. He is the builder and pilot of the Galbaldy Rebake.

Genos (ジェノス, Jenosu) is the deuteragonist of One-Punch Man. He is a 19-year-old cyborg and the disciple of Saitama. He is always aiming to become more powerful and he fights for justice. Under the Hero Association, he is given the name Demon Cyborg (鬼おにサイボーグ, Oni Saibōgu) and is currently S-Class Rank 12.

Sekai Kamiki (カミキ・セカイ, Kamiki Sekai?) is a character introduced in Gundam Build Fighters Try and one of the main protagonists of that anime.

From Gundam Build Fighters Try

Aila Jyrkiäinen (アイラ・ユルキアイネン, Aira Yurukiainen?) is a character introduced in the anime Gundam Build Fighters.

Mizuki Shido (シドー・ミズキ?) is a character in the Gundam Build Divers Re:RISE television series.

Masaki Shido (シドー・マサキ?) (aka Sid in GBN) is a character in the anime Gundam Build Divers Re:RISE. He is the builder and pilot of the MSF-007TE Gundam Tertium. He later becomes The Masked Man (仮面の男, Kamen no Otoko?), piloting the MSF-007SS Gundam Seltsam.

Aya Fujisawa (フジサワ・アヤ, Fujisawa Aya?, commonly called by her Diver name Ayame (アヤメ, Ayame?)) is a character who appears in the Gundam Build Divers television series. She is the builder and pilot of the RX-零 RX-Zeromaru.