Major Zairin

ザイリン・ド・ザルツ

The first member of the militaristic nation of Digald encountered by Ruuji. He accidentally damages the Generator at Ruuji's village and becomes a persistent antagonist to him. While appearing suave and charming, he can also be ruthless in combat. Nevertheless, he prefers to conquer territories and cities rather than destroy them, unlike other Digald commanders such as Georg.
He was inducted into Digald when its forces attacked his village. In episode 24, he witnesses the pollution spread by Digald's industry and the suffering of former villagers. For most of the story, Zairin was portrayed as an obsessed Zoid pilot seeking a worthy challenge, longing to face Ruuji in a fight to prove his worth.
Zairin had long suspected something was wrong with Digald, but it was not until he discovered that droid Digald pilots were actually human souls (including his long-time friend Whips) that he defected to join Ra-Kan's group. Ruuji and Zairin made peace with each other and cooperated in their campaign against Jiin. Zairin proved instrumental in the final battle, being the one to disable Jiin's bio particle cannon with a blast from his own. He was also the one who helped expose Bio-Tyranno's Zoid core, allowing Ruuji to strike it with Mugen Liger. After the defeat of Jiin, there was no epilogue to detail the fate of the characters, so it is only speculated that Zairin probably went back to restore his village.
He pilots a MegaRaptor, a larger version of the Digald Bio-Raptor, with claws that can block metal Zi weapons. After he was defeated by Ruuji in Hayate Liger, Zairin was rescued and given Bio-Volcano. In giving Zairin his Bio-Volcano, Jiin actually had a device that drained Zairin of his life energy. The device was eventually removed and Zairin was apprised of it.