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)

[Profile](https://www.aoni.co.jp/search/hirano-masato.html)

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

Fight! Super Robot Lifeform Transformers: The Comics collects every issue of the original Generation 1 Transformers manga published in the pages of TV Magazine. Fight! Super Robot Lifeform Transformers Prologue (2 issues, 05/85-06/85) 
Hundreds of thousands of years ago there existed a highly-advanced planet called Cybertron. The planet was controlled by two factions of super robot lifeforms: the heroic Autobots and the evil Decepticons. 
Their endless war drained Cybertron of all its energy, leading to both factions leaving the planet in search of new energy sources. Their battle raged on, eventually reaching the vicinity of prehistoric Earth. Fight! Super Robot Lifeform Transformers (8 issues, 04/86-11/86) 
Trouble is brewing in Tokyo, Japan &ndash; Starscream, Skywarp and Thundercracker are on the attack, out to pillage energy and cause some general destruction. But the Autobots have pursued their foes to Japan, and Optimus Prime, Smokescreen, Wheeljack, Trailbreaker and Sideswipe speed onto the scene, just in time for Prime to transform and save a young boy named Kenji. The Story of Super Robot Lifeforms: The Transformers (5 issues, 12/86-04/87) 
Responding to an SOS, an Autobot team consisting of Rodimus Prime, Ultra Magnus, Kup, Blurr, Springer and Arcee head into space at full speed, and discover the spaceship that sent the call for help held prisoner by another. The Great Transformer War (3 issues, 04/87-07/87) 
(aka Transformers: Big War) 
The Decepticons have captured Dalton, a brilliant scientist from the planet Elan, but he is refusing to work with them, and the Aerialbots and Protectobots are already on their way towards Trypticon to rescue him. "Great Decisive Battle of Planet Beast!" (special, 08/87) 
With White Leo and Rodimus Prime away, the Decepticons and their Beastformer allies make another attempt to conquer planet Beast. Transformers: The Headmasters (8 issues, 08/87-03/88) 
As the Autobots and the recently-arrived Autobot Headmasters ruminate on the current state of play &ndash; the death of Optimus Prime, their base on the planet Athenia, the power of the Headmasters &ndash; Galvatron leads the Decepticon Headmasters in a plot to destroy Battleship Maximus. Transformers: Super-God Masterforce (12 issues, 04/88-03/89) 
(aka Transformers: Masterforce) 
After the events of The Headmasters, the Autobots and Decepticons have departed Earth... or have they? Transformers: Victory (10 issues, 04/89-01/90) 
The Victory War begins as Star Saber and Deathsaurus face-off on Earth! Transformers: Zone (special, 04/90) 
When nine of the most powerful Decepticons are gathered together under the rule of Violen Jiger, Autobot Powered Master Dai Atlas must step forward to prevent them from acquiring the power of the mystical Zodiac. Transformers: The Battlestars (special, 08/91) 
Super Megatron attempts to pillage energon from an oil rig, only to be confronted by Star Convoy! 
(Information collected from Transformers Wiki and TFArchives).

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.