Gaihawk (ガイホーク Gaihōku) is one of the founding members of Deathsaurus' Breastforce. Gaihawk carries a burning hatred toward the Autobots after spending years on the prison moon of planet Micro. This raging hatred accompanied with his raw power makes him a formidable opponent for anyone who dares to get in his way.
In jet-mode, he is capable of unleashing a hellish storm of laser fire from above, rendering even the toughest of enemies to piles of smoldering ash. In robot mode he wields the power of the "Ice Needle," an attack which allows him to fire an onslaught of super-cooled plasma daggers from his hands capable of tearing through even the toughest of metals. His chest plate, Hawkbreast, can detach and transform into a hawk-like attack partner or a handheld blaster.
He can combine with his fellow Breastforce warriors to form Liokaiser.
- Voice actor: Yoshitada Ōtsuka (Japanese)
Gaihawk was imprisoned on Planet Micro sometime before Star Saber assumed command of the Space Defense Force. Sometime later, after a series of attacks on Micro, the other Breastforce members busted him out. During the escape, Gaihawk was confronted by his old partner, Great Shot, who had switched sides in his absence. After each tried to convince the other to change their ways, the former friends engaged in a blaster duel and became bitter rivals from then on.
Leozack called a meeting with all of the Breastforce members except Hellbat after Gaihawk's rescue. During the meeting, Gaihawk seemed to more or less get along with the other members. When Leozack revealed that they were getting a new member to replace the treacherous Hellbat, Gaihawk could not believe that Hellbat was so untrustworthy.
When Hellbat reported that the new Breastforce member, Deathcobra, had been killed, Gaihawk showed more emotion than the other four. Possibly, he had been friends with Deathcobra. Gaihawk instantly jumped to the conclusion that Deathcobra had been killed on Star Saber's orders and requested to be allowed to remain and settle his vendetta with Star Saber. What this vendetta is has not yet been revealed.
- Guyhawk [sic] (Breastforce, 1989)
- Japanese ID number: D-330
- Released only in Japan, Gaihawk transforms into a red and white MiG-29 fighter jet. He also forms the right arm to the combined robot Liokaiser. Gaihawk came packed with his breastplate/weapon/beast partner Hawkbreast
- Liokaiser (Gift set, 1989)
- Japanese ID number: D-335
- Gaihawk was also available in a complete six-piece box set of the entire Breastforce team. It's worth noting that this release does not have bio/tech cards for the individuals, only the combined form.