HAZMAT

HAZMAT is an Autobot-allied Junkion from the cartoon portion of the Generation 1 continuity family.

HAZMAT is a Junkion.

Fiction

Voice actor: Keiichi Nanba (Japanese)

It's not great art, but at least now you know what color HAZMAT's legs are. Both HAZMATs' legs.

HAZMAT was among the Junkions that attacked the Autobots stranded on their planet, until the arrival of Hot Rod's party. The young Autobot's offering of the universal greeting and an energon goodie was well received by the Junkions, who enthusiastically repeated the greeting. The Transformers: The Movie

Left: the model with a face found in the Generations guidebook.
Right: the model published in the The Ark series books.

HAZMAT was never named in any fiction; his name (and the names of many other Junkions) comes from character designer's notes, revealed in Transformers: The Complete Ark.
Due to the rarity of the Toei Junkion character models, which have only surfaced in the Generations guidebooks as tiny, blurry and very rough line art, the model that was used for The Ark was traced/redrawn by Bill Forster to make it more presentable for the final publication. This resulted in a lot of the original details getting lost; namely his face which interpreted the "goggles" on his head as eyes, with the "cheekbone" and visor details being picked out as a mouthplate.
HAZMAT's character model is mostly recycled from Junkyard, sharing the same torso, arms, and legs, with a new head. His arms are also shared by Ashtray and Wasteoid Gamma; his legs by Greasestain, and Wasteoid Gamma; and his torso by Greasestain.
The Legacy: Evolution character Crashbar was drafted as a toy of this character at one point in development, with Dan Khanna contributing a concept drawing of HAZMAT.