Borr

Borr (ボラー) is one of the four Neon Genesis Junior High Students that act as support units for Gridman. He is also the Assist Weapon Buster Borr (バスターボラー).

SSSS.GRIDMAN
Borr showed up with the remaining two Junior High students after Anti had defeated Gridman and Calibur. The trio invited themselves into the Junk shop, already aware Gridman was alive. Borr used Rikka's phone to tell Calibur to come out of Junk. He and the other Assist Weapons continue to fight alongside Gridman and Yuta.

Trivia

 * His counterpart in Denkou Choujin Gridman is Twin Driller, the second of the God Zenon set of Assist Weapons created and controlled by Ippei Baba and Yuka Inoue to assist Gridman.
 * His name is based off of Borr, the English name for the Twin Driller in Superhuman Samurai Syber-Squad.
 * Originally presumed to be female, Borr's voice actress confirms on Twitter that the disguised Assist Weapon is in fact male. Even Aoi Yuki acknowledges this surprising twist and calls him "Borr-chan-kun" (ボラーちゃんくん).
 * There was some further confusion regarding Borr's gender because his Funimation voice actor initially refereed to him as a girl . This has since been rectified.
 * The brooch on his vest is a reference to the Dinobot, Scorn, from Transformers Age of Extinction.
 * When combined with Gridman, Borr's components took a similar appearance to Drill Max from Brave Fighter Exkizer.