Sho Fukamachi

Voiced by: Kenji Nojima (Japanese), Chris Patton (English)

The series protagonist. Age 17. Sho was a second-year student at a Tokyo-area high school when he and his best friend, Tetsuro Segawa, stumbled upon one of the missing G-units. Sho inadvertently activates the unit and merges with the bio-boosted armor. Labeled "Guyver I" by the Cronos Corporation, Sho must fend off the advancing swarms of Zoanoids dispatched by the corporation trying to recover the G-unit, while also protecting those close to him.

 

Tetsuro Segawa

Voiced by: Kosuke Takeuchi (Japanese), Lowell Bartholomee (English)

Sho's closest friend. A third-year student attending the same school as Sho. Tetsuro is a science fiction fan and the president of the school's Sci-Fi society club, which gives him some knowledge to make quite a few assumptions about the things involving the Guyver.

 

Mizuki Segawa

Voiced by: Nana Mizuki (Japanese), Luci Christian (English)

Sho's romantic interest and Tetsuro's younger sister. She is an average high school girl attending the same school as Sho and her brother. Initially infatuated with Agito Makishima, Mizuki develops Sho a lot more, to the point where her affections have completely shifted over to him.

 

Agito Makishima

Voiced by: Katsuyuki Konishi (Japanese), Brian Jepson (English)

Agito is a third-year student at the same high school the others attend. He almost never allows sentiment to stand in his way. He does not even show much expression in his face, but acts quite friendly at school. He finds a Guyver unit and merges with it to become "Guyver III." Agito also seems to have extensive knowledge on the Guyver and its abilities and exhibits them quite well. Agito seems to have his own agenda when it comes to dealing with Chronos. He is an excellent example of an anti-hero.

 

Natsuki Taga

Voiced by: Tomo Adachi (Japanese), Kira Vincent-Davis (English)

A high school girl that attends the same school as Sho and his friends. She is also a close friend to Sho and the Segawa siblings. She becomes of great help to them later when they are forced into hiding after the apparent deaths of Sho, Agito, and Masaki.

 

Richard Guyot

Voiced by: Kinryu Arimoto (Japanese), Bill Wise (English)

Guyot is tall, powerfully built man. In the beginning of the series, he acted as the commander of Chronos Japan branch after Agito Makishima's foster father, Genzo Makishima, failed to retrieve the Guyver units. He has an immensely commanding presence.

 

Masaki Murakami

Voiced by: Mitsuaki Madono (Japanese), Andrew Love (English)

Masaki was a freelance journalist captured by Cronos and used as a guinea pig in the Zoalord development program. He is a tall, thin young man with shoulder-length hair, and normally wears sunglasses, even at night. He joins with Sho to fight Cronos, having his own revenge in mind. He does not quite trust Agito at first because of Guyver III's earlier connections with Chronos.