“ | You humans will perish soon. Shame about the Gransazers. (Professor Horiguchi: Just as I thought. You came here to destroy the Gransazers?) Exactly. I made them fight each other. | „ |
~ Karin reveals her intentions of destroying Gransazers to Professor Horiguchi |
“ | Akira, the Gransazers can't win. Mankind will perish. But you can survive. (Akira: If you're going to destroy mankind, I'll defeat you, even if it kills me.) How disappointing. | „ |
~ Karin trapped Akira inside her body so they could be together while leaving the rest of humanity, including his fellow Gransazers, to be annihilated. |
Karin Saeki is a major antagonist in Chouseishin Gransazer, serving as the main antagonist of episodes 1-12. She is an Akelon alien serving the Warp Monarch who took the guise of the deceased physicist, Karin Saeki.
She was portrayed by Mika Chiba.
Biography[]
"Karin" was sent to Earth by the Warp Monarch to preemptively eliminate the Gransazers before the Warp Monarch began their full campaign to wipe out humanity. Upon her arrival on Earth, the Akelon took the guise of the deceased physicist Karin Saeki to survive within Earth's atmosphere.

Karin and Akira after witnessing Tenma awakening his power.
Using this disguise, Karin sought out the three members of the Wind Tribe and manipulated them into attacking the Flame Tribe, convincing them that the other Gransazers were a threat to the planet. Akira, the leader of the Wind Tribe to ensure his loyalty to her. However, the Wind Tribe began to doubt their mission after witnessing Karin injure a civilian in an attempt to attack Tenma. This distrust eventually led Ryoko and Jin to leave and join with the other Gransazers, causing Karin to reveal her true Akelon identity and try to kill them. Despite this, Akira remained loyal to her even after discovering she was an alien until the other Gransazers revealed the truth to him about her. He would then turn on Karin as she was battling Tarious and knock her off the building to her apparent death.

Karin is finally destroyed once and for all after she was finished off by Chouseishin Garuda.
However, Karin managed to recover before she could be autopsied. The Akelon then headed to Ryujin Mountain and summoned her ship to heal her injuries. Karin then attacked Naoto to lure out the Gransazers. The Flame Tribe soon show up and beat her back, prompting Karin to transform into her Nova-Beast form. The Gransazers then summon Garuda and Dorcruz to combat her. Karin at first holds them off, but quickly falls back to heal her burn injuries by Garuda. She also absorbs Akira into her, planning to spare him from being killed with the rest of humanity so they can be together, but Remls is able to breaks free from her body. The three Gransazer tribes then destroy Karin's spaceship, before using their Chouseishin to eliminate her.
Her remains were later taken by the JSDF and used to create Clo-Akelon.