Ginrai

A free-spirited trucker born in Nagano who moved to America in pursuit of freedom and self-discovery at the age of 17. Even though he can be very brash and short-tempered, he has a very relaxed approach to life, a strong sense of justice, and cares deeply for the Headmaster Juniors, especially Shuuta, who often sees him as an older brother of sorts.

Initially living in solitude, he would go on to become a Cybertron warrior following at attack by the Destrons that resulted in the deaths of numerous truckers that he was friends with - Metalhawk would scout him out, and shortly after, appoint him the Supreme Commander.

His Transtector takes on a form resembling that of the Cybertron Supreme Commander, Convoy. Before the Transtector was stolen by Devil Z, it was meant to serve as one of many different means of attempting to bring Convoy back to life.

Following a battle with Deathsaurus, his Transtector, now possessing a personality of its own, would go on to be rebuilt into Victory Leo.

(Sources: JP Wikipedia, translated; TFWiki)