Hardhead is a soldier to his core. A soldier with a stubborn streak a megamile wide. He's stubborn to the point of rejecting outright any path but his own, any idea that goes against his natural instinct or inclination (namely fighting), and any advice he didn't come up with himself. He doesn't talk much, and when he does, it tends to be blunt and terse, if not outright rude. A soldier doesn't waste time on social niceties when there's a war to fight.

Headmasters starts with Galvatron leading a new batch of Destrons to wage war on Seibertron, the Destron Headmasters. The Cybertrons are rescued by the arrival of the Cybertron Headmasters, led by Fortress (Cerebros, the head of Fortress Maximus). It is revealed that Fortress left Seibertron millions of years ago in search of energy, and have finally managed to come home. He explains that the Headmasters are from a planet called Master; the human-sized robots who live there built themselves Transformers-sized bodies. They can then transform themselves into the heads of the robots, and have now joined the Cybertron-Destron war.
 
(Source: Anime News Network)

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Non-anime roles:
~!Harenof in "Dragon Quest II" (drama audio)  The Fury in "Metal Gear Solid 3: Snake Eater" (VG, 2004) (Japanese)!~

Starting off as 4koma and published online to promote the titular Transformers Legends toyline, with special Bonus Edition (出張版 Shutchōban) chapters of the comic packed with the toys themselves, it Initially showcased the misadventures of the Beast Wars cast re-imagined as adult Transformers fans, before eventually taking a more story-driven approach and attempting to connect all the entries of the Japanese Generation 1 anime and manga continuity into one storyline. 

Heavily marketed towards adult collectors and otaku in the face of the brand's dwindling popularity with children after TakaraTomy's largely unsuccessful first attempt in the mid-2000s, it attempted to change the image of the Transformers franchise, with much more "adult", often ecchi-filled humour and numerous references to fan culture.
 
Ulltimately concluded when TakaraTomy began a brand unification with Hasbro starting with Power of the Primes, deciding to mainly sell Hasbro toys as is with minimal changes to packaging. It was eventually succeeded by the more action-oriented Generations Selects Special Comic promoting Hasbro and TakaraTomy's joint Generations Selects imprint. (Source: TFwiki, edited)

Tie-in manga for Hasbro and Takara's Kre-O blocks Transformers product line. The story follows various comedic shenanigans involving Transformers Kre-O sets and figurines, at times retelling the events of Transformers Generation 1 anime's episodes.
 
Note: Chapter count includes a prologue chapter and a special chapter included in the product catalog.