Keiji is a man who cares about his fellow crew members, who he wants to protect at all costs, as well as humans in general. The latter is shown when he jumped to save Hong , his enemy, when she was being attacked by a Terraformar inside the Annex I.

Different from his fellow crew members Marcos E. Garcia and Akari Hizamaru Keiji is rather prudish around women as he was visibly uncomfortable with the prospect of drinking Echdina milk from Peggy Fortie's stomach and visibly embarrassed by the sight of a nude Xi Chun-Li. He also refuses to hit people, keeping those words even when Xi damaged his ribs as well as one of his testicles, such belief coming from his father, teaching him how he must be strong in order to help anyone, even those who don't have anything left but violence to go forward in life.

The second season of Terra Formars. 
 
In Terra Formars Revenge, the crew members of the Annex I continue to fight against Terraformars—the large humanoid cockroaches that evolved from the ones sent to Mars centuries ago. However, far from discovering the cure for the lethal Alien Engine Virus that has been plaguing Earth, the Annex I team have learned that some squadrons have agendas from their own countries. Now, the squadrons must not only fight against the Terraformars for their survival, but also each other in the never-ending battle for international dominance.

**Height:** 174 cm (5'8.5")

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**Non-Anime Roles**:
- Jing Yuan - Honkai: Star Rail (VG)
- Wriothesley - Genshin Impact (VG)
- Van Arkride - The Legend of Heroes Series (VG)


During the 21st century, humanity attempted to colonize Mars by sending two species which could endure the harsh environment of the planet to terraform it—algae and cockroaches. However, they did not anticipate the species' remarkable ability to adapt. Now in the 26th century, a lethal disease known as the Alien Engine Virus has arrived on Earth, and the cure is suspected to be found only on Mars. The problem is, Mars in the present is overrun by creatures known as "Terraformars," incredibly powerful and intelligent humanoid cockroaches that mutated from those originally sent to the planet. 

The Annex I team, consisting of a hundred men and women genetically enhanced with characteristics of powerful organisms from earth, has been sent to Mars on a mission to find the cause of the Alien Engine Virus and to help cure humanity—signalling the start of the crew's fight for survival.

Adaptation of the Earth arc events happening in volume 21 and 22 of the manga.

After humanity’s first manned mission to the Red Planet was lost, a second expedition arrives. The explorers prepare to exterminate the cockroaches that were used to transform the Martian environment, but are shocked to discover that the insects have mutated into giant, aggressive humanoids with one overriding goal—exterminate the humans! However, this crew of explorers has each undergone the “Bugs Procedure,” terrifying experimental surgery designed to make them more than human…
 
(Source: Viz Media)

You will know the man, the boxer, Keiji Onizuka.
Before Annex 1 sets out for Mars, Keiji is stationed in U-NASA's branch office in Japan undergoing training. What unknown incident will he be pulled into?

 
(Source: Anime News Network)