Haru Irei, who witnessed the 1/1 scale RX-78-2 Gundam in Odaiba, becomes inspired to build Gunpla, which is a portamanteau of Gundam Plastic model kit. Haru purchases a one of a kind Gunpla, the GPB-X80 Beginning Gundam. After building the kit, Haru, now a Gunpla Builder, and the Beginning Gundam enter the virtual world of Gunpla Battle, where players can pilot their customized Gunpla in team matches or one-on-one fights. Haru must rely on the support of his friends if he is to become a Gunpla Battle Champion and attain the rank of Gunpla Meister.
- Haru Irei (イレイ・ハル Irei Haru?)
- Voiced by: Tsubasa Yonaga
- The protagonist of the series; a boy who becomes a "Gunpla Builder" after seeing the 1/1 RX-78-2 Gundam statue and encountering the 1/144 HG Beginning Gundam plastic model. He pilots the GPB-X80 Beginning Gundam and later the GPB-X80-30F Beginning 30 Gundam.
- Rina Noyama (ノヤマ・リナ Noyama Rina?)
- Voiced by: Mariya Ise
- Haru's friend, a cheerful girl who is a big fan of Gunpla, though she doesn't know much about it and also not so good at gunpla battles. She pilots the GPB-04B Beargguy.
- Kenta Sakazaki (サカザキ・ケンタ Sakazaki Kenta?)
- Voiced by: Nobuhiko Okamoto
- Haru's friend who loves Gunpla and gives advice to Haru about building them. He serves as Haru's wingman in gunpla battles. He initially pilots a white Hyaku Shiki, known as the MSN-00100 Byaku Shiki and later upgrades to the MSN-04 Sazabi (GPB Color Version).
- Koji Matsumoto (コウジ・マツモト Matsumoto Koji?)
- Voiced by: Hiroshi Kamiya
- A talented, yet cocky Gunpla builder and battler. He is Haru's very first opponent, which ends in his loss, acknowledging Haru as his rival. He pilots a customized RX-93-ν2 Hi-ν Gundam
- Tatsu Shimano (Shimano Tatsu)
Voiced by :Miyu Irino
- A Gunpla builder and guitarist, Tatsu seems to have a split personality. In the real world, he is calm, softspoken, and humble. However, when he enters a Gunpla Battle, his personality becomes bloodthirsty and sadistic, only seeking victory. He is Haru's second opponent. He pilots the GPB-06F Super Custom Zaku F2000.
- Hinode Irei
Voiced by :Ken Narita
- A former gunpla builder and Haru's father.
- Boris Schauer (ボリス・シャウアー Borisu Shaua?)
Voiced by :Daisuke Namikawa
- A "Gunpla Meister" and veteran of Gunpla battles who is well known in the Gunpla world. Impressed by Haru's skill, he challenges Haru after the latters first battle and helps improve throughout the series. He pilots the GPB-X78-30 Forever Gundam.
- Manager (店長 Tenchō?)
- The manager of the Axis Hobby Shop who both sells Gunpla models and parts and gives advice on Gunpla battles to Haru and his friends. He seems to be friends with Boris Schauer.
Voiced by :Taketora
- One of Boris' wingmen during the Gunpla Battle Championship. He pilots the RX-79BD-1 GM Blue Destiny Unit 1
- Diana Lee
Voiced by :Aya Endō
- One of Boris' wingmen during the Gunpla Battle Championship. She pilots a MS-18E Kämpfer.
|#||Episode Title||Japanese Airdate||English Airdate|
|1||Part A: Beginning Gundam||15 August 2010|
|2||Part B: Forever Gundam||31 October 2010|
|3||Part C: Beginning 30||19 December 2010|
List of Mechanics
Gunpla Builder Custom Mobile Suits
- AMX-107 Bawoo (GPB Color Version)
- GPB-X80 Beginning Gundam
- RX-93-ν2 Hi-ν Gundam (GPB Color Version)
- GPB-06F Super Zaku Custom F2000
- GPB-04B Beargguy
- GPB-X78-30 Forever Gundam
- MSN-00100 Byaku Shiki
- MS-05L Zaku I Sniper Type (GPB Color Version)
- PMX-003 The O (GPB Color Version)
- MSN-04 Sazabi (GPB Color Version)
- RX-77-2 Guncannon (GPB Color Version)
- MSM-07 Z'Gok (GPB Color Version)
- MS-06F Zaku II (GPB Color Version)
- MS-14 Gelgoog (GPB Color Version)
Mobile Suits from past series
- RX-78-2 Gundam (1/1 scale statue only)
- MS-09B Dom
- NRX-044 Asshimar
- YMS-15 Gyan
- MSM-03C Hygogg
- MA-08 Big Zam
- MBF-P02 Gundam Astray Red Frame
- RX-78GP03D Gundam "Dendrobium Orchis"
- MS-18E Kämpfer
- RX-79BD-1 Blue Destiny Unit 1
- EMS-10 Zudah
- MAM-07 Grublo
- MS-06 Zaku II
- MA-04X Zakrello
- Model Suit Gunpla Builders A
- Model Suit Gunpla Builders Beginning D
- Model Suit Gunpla Builders Beginning J
- Gundam Build Fighters
- Most of the Gunpla Models that were in the series were based in the Universal Century Era. The only exception is the Astray Red Frame while the rest of the models were originals.