ARMS JAB is a fan fiction series of short stories set in the ARMS universe, sometimes focusing on off-screen events or scenarios based off ideas presented in the original game and artworks. The series was written by Exotoro(t∣b∣c). The title, ARMS JAB, is a reference to both the boxing move jab and is a acronym for Just A Bit.
ARMS JAB: Lab Rat is the first entry in the series, featuring twin stories centering around the characters Dr. Coyle and Min Min. Dr. Coyle is close to finding the secret behind ARMS as lab rats begin to successfully produce ARMS-like tails and is wondering what to do with Helix given he is a unsuccessful experiment. Min Min brings Mechanica to her family's noodle shop, where Mechanica meets her abrasive sister, Ram Ram. Centering around characters without ARMS, this story explains how Helix escaped ARMS Labs and where the Ramram ARM type comes from.