Gundam Build Fighters: Steel Builders

Gundam Build Fighters: Steel Builders (ガンダムビルドファイターズ: 鋼のビルダー, also known as GBF:SB) is a Japanese science fiction 12-minute anime web series based on Sunrise's long-running Gundam franchise. The series serves as a spin-off to the Build Fighters series.

Summary
A trio of three young Gunpla Builders who took many Gunpla Battles, with their kits only equipping physical weaponry.

Steel Builders

 * Kenji Tsukiyama (Katsuyuki Konishi)
 * Ringo Akisawa (Aya Endo)
 * Ains Mittelman (Hiroshi Kamiya)

Alexandra Siblings

 * Natalie Alexandra (Miyuki Sawashiro)
 * Leo Alexandra (Ryohei Kimura)

The Seven Stars

 * Aina Kirishima (Megumi Han)

Supporting characters

 * Crank (Yasuhiro Mamiya)
 * Chisato Himawari (Kaori Nazuka)

Others

 * Takumi Murasaki (???)

Steel Builders

 * ASW-G-08/K Gundam Barbatos Kenji custom
 * EB-06/AS Graze (AS)
 * EB-05s/R Schwalbe Graze R
 * MS-06R-1A/SB High Mobility Type Zaku II Ains custom

Alexandra Siblings

 * AMS-119 Geara Doga Natalie custom
 * AMS-129 Geara Zulu (Guards Type) Leo custom

The Seven Stars

 * ZGMF-1017/7S GINN Seven Stars custom (x2)
 * ZGMF-1000/7S ZAKU Warrior Seven Stars custom (x2)
 * ZGMF-X2000/7S GOUF Ignited Seven Stars custom (x2)
 * ZGMF-XX09T/7S DOM Trooper Aina custom

Other

 * EB-06 Graze
 * GAT-01A1/C Dagger Close Combat type

Production
Asako Nishida (Love Live! School Idol Project) serves as the main character designer of the series, rather than Kenichi Ohnuki & Suzuhito Yasuda.

Yuki Hayashi will compose the music for the series, along with Masaru Yokoyama.

Trivia/Notes

 * There are little fan speculations that Steel Builders takes place in the combination between Build Fighters and Love Live universe, due to Asako being involved with the project.
 * Continuing the trend of deceased Gundam characters being reincarnated in the Build Fighters Universe:
 * Crank and Ains Mittelman were based on Crank Zent and Ein Dalton from Gundam Iron-Blooded Orphans.
 * Some of the characters from Love Live! made cameos in the series.