is a Japanese tokusatsu series that serves as the 16th installment in the Kamen Rider franchise and the seventh entry in the Heisei era. These characters play a major role within the series and often influence many key events.

Main characters Souji Tendou , birth name , is a wild card and possessor of the , which he acquired on the day of the meteor along with the from the Native doppelgänger of his father . After his parents were killed by Natives when he was three years old, Souji was taken in by his maternal grandmother and his surname was changed to Tendou. This played in Souji having a sense that is meant for greatness that makes him initially appear arrogant but is very compassionate. He often seems to follow monk-like philosophies of peace, using the kanji in his full name for his formal introduction; , or quoting amazingly appropriate zen-like phrases he supposedly learned from his grandmother. Having no job or college education despite being very talented, Souji normally stays home with Jyuka before becoming a regular customer at Bistro La Salle after meeting Hiyori Kusakabe, whom he recognizes as both the girl he saved and a Native Worm whom he considers his little sister. This played in his ability to recognize Worms in disguise merely fights for his own needs to wipe the aliens out and provoking ZECT as a result. After defeating the Worms and ZECT's corrupted higher ups, Souji leaves Japan to travel to France.

As Kamen Rider Kabuto, Souji is usually in his pupa-like armored before using the Kabuto Zecter's command to assume the sleeker and more combat-oriented , which can either use the ability to travel at near-light speeds to match the speed of the Worms or perform the finisher. He also wields the , which has a for performing the finisher, an for performing the finisher, and a for performing the finisher. His personal vehicle is the motorcycle, which can switch between its Honda CBR1000RR-like and its battering ram-like .

Souji later acquires the , a Zecter made by ZECT in the future, which enables him to assume by using the command. As an evolution of Rider Form, he is capable of using the stronger ability to move at great enough speeds to potentially travel seven years through time as well as to perform the finisher. He also acquires the , which can switch between and Gun Mode. By increasing the Perfect Zecter's power with the TheBee, Drake, and Sasword Zecters, he can perform either the finisher via Sword Mode or the finisher via Gun Mode.

Souji Tendou is portrayed by . As a teenager and a child, Souji is portrayed by and .

Arata Kagami is the son of ZECT's leader Riku Kagami, unaware of the organization's true agenda while fighting for the betterment of humanity as . Having joined ZECT to avenge his younger brother Ryou Kagami, works with Hiyori at Bistro La Salle, Arata has a good heart but is impulsive often acts without thinking. In the previous timeline, Kagami married Hiyori Kusakabe before helping Souji alter the timeline so the damage caused by the Worms' meteor would be minimized in Shibuya. In the new timeline, Arata meets Souji all over again when the latter claimed the Kabuto Zecter that he was to upon its completion. Being the only member of ZECT to know Souji's identity as Kabuto, momentarily using TheBee Zecter after Yaguruma was relieved of his duty, Arata became torn between his duty to ZECT and seeing Souji as a friend.

Arata eventually acquired the and becomes Gatack in the current timeline while learning the truth behind ZECT. They managed to wipe out most of the Worms before helping the rebels against the compromised ZECT led by Masato Mishima and the Native-class Worm leader Negishi. After ZECT was defeated, Arata started a new life with his father in the police force. During the events of Kamen Rider Zi-O, learning he is one of the few to remember ZECT and the Worms due to a time distortion, Arata helps the titular protagonist prevent a new Worm invasion while representing Souji.

As Kamen Rider Gatack, Arata is usually in his Masked Form equipped with the twin shoulder-mounted cannons, which possess a shooting radius of 1 kilometer, before using the Gatack Zecter's Cast Off to assume Rider Form where he gains access to Clock Up and can perform the Rider Kick. He also dual wields a pair of shotels consisting of the gold-colored and the silver-colored , which can combine into a scissors-like claw that allows him to perform the finisher. His personal vehicle is the motorcycle, which similar to the Kabuto Extender can switch between its Honda XR250 Motard-like Masked Mode and its hoverboard-like Ex Mode.

During the events of the Hyper Battle DVD special Kamen Rider Kabuto: Birth! Gatack Hyper Form!!, Arata acquires his own Hyper Zecter to assume Hyper Form.

Arata Kagami is portrayed by .

Hiyori Kusakabe is first shown as a co-worker of Arata's at the Bistro la Salle. She was involved in the meteor crash seven years ago along with Souji. Due to the accident, her parents were killed. She believed that they were murdered by a person wearing a Rider Belt, but after a period of uncertainty she concludes that Souji, despite owning the belt, would never do something like that. After seeing Gatack wear another belt and discovering that he was Arata, she also began to doubt him. In the end however, she decides to trust both of them as they have helped her so much. She carries a green crystal that originated from Area X, ground zero of the meteor crash. She seems to be able to talk with and read the emotions of inanimate objects, such as drawings and machines. She's quite clumsy and tends to zone out while working, resulting in complaints by customers. Through several mishaps and accidents, she was able to discover the identities of all the Riders besides Drake. Later in the series, it was discovered that Hiyori is the child of a Native Worm who impersonated Souji's mother down to her pregnancy, and later gave birth to . This technically makes her Souji's younger sister. During episode 33, the energy charge from the Hyper Zecter sent her along with the Native doppelgänger of Souji to the edge of time and space. The Hyper Zecter later appeared in the normal dimension, showing one of Hiyori's drawings to Souji and Arata.

She reappeared during episode 38, being led away by the doppelgänger, at the edge of time and space. She returns to the real world in episode 43 to defend Dark Kabuto from Hyper Kabuto, stating that she no longer desires to live in the human world. Ultimately however, after a compelling speech by Souji saying that she will not be hated in the human world, even though she is a Worm, she abandons the doppelgänger and returns to the human world. However, she is then attacked by Dark Kabuto. After being saved by Souji, she returns to an almost normal life, and begins making her own menu and dream of owning a restaurant come true. During the epilogue, she returns to her normal life in working at the Bistro la Salle, and now has Jyuka as a sister. As a human, she is 18 years old.

Hiyori Kusakabe is portrayed by . As a child, Hiyori is portrayed by .

Recurring characters

Jyuka Tendou 13-year-old is presented as Souji's younger sister, but in truth seems to be adopted. They were both taken in by their grandmother after the Shibuya meteorite crash. She's really close to Souji, whom she calls "older brother", and tends to act the same way he does, such as talking about her grandmother and pointing to the sky. She was injured in a car crash caused by Kamishiro, but blows it off to her brother's concern. She also assists her brother in running noodle carts across town. She has different ways of saying "Good Morning" to Souji and loves his cooking. Lately, she has been targeted by ZECT and the Worms. So far, two Worms, disguised as Misaki and Daisuke, have tried to either kidnap or kill her.

She seems to eventually becomes aware of the Zecters when the Kabuto, TheBee, and Drake Zecters begin to fly around the entire Tendou household, while the Sasword Zecter crawls on the dining table. During the epilogue, it is shown that she has accepted Hiyori as her "sister" and is now working with her at the Bistro la Selle.

Jyuka Tendou is portrayed by .

Yumiko Takemiya Hiyori and Arata's 36-year-old boss at the Bistro la Salle restaurant, seems to tolerate Hiyori's clumsiness and Arata's tardiness. She sometimes requests Tendou to be her cook as he is a usual customer.

Yumiko Takemiya is portrayed by .

Daisuke Kazama is a metrosexual make-up artist who openly befriends women, seeing them as the treasure of life. His partner, a little girl named Gon, always follows him around, completing sentences for him since Daisuke seems to be in eloquent at times. Prior to his first appearance, he accidentally found the means to become .

Utilizing the in conjunction with the pistol grip, Daisuke can transform into Kamen Rider Drake. While his Masked Form grants underwater diving capabilities, he can assume Rider Form via the Drake Zecter's Cast Off to either access Clock Up or perform the finisher.

Daisuke Kazama is portrayed by .

Gon , real name , is an 8-year-old girl whom Daisuke has accompanied. She seems to have amnesia but at the beginning of episode 17, she slowly remembers time before she met Daisuke. Gon also pictures her mother , but cannot make out who it is. She always completes Kazama's sentences for him, usually after make-up sessions. She is incredibly mature for her age, often taking initiatives which surprise even Souji. In the end, after remembering her mother's face on the day that they were attacked at the bus by the same Worm that tried to kill her mother, she was finally reunited with her mother. Drake killed the Worm, and Gon completely remembered her past but unfortunately forgot about Daisuke and treated him as a complete stranger afterwards. However, she regained her memories of being Gon while reading an article on Daisuke in a teen magazine. She also helps Daisuke regain his Drake Zecter from his Worm imitation. She recently discovered the identities of the first five Riders, when they ganged up on Daisuke, who they believed was a Worm. In her latest appearance, she has given the Drake Grip to Souji after stealing it from Daisuke. She returns to help both Daisuke and Rena with the Hopper Riders by spraying them with a fire extinguisher; however, when Rena gains her Worm memories, she is attacked by Rena. During the epilogue, she is still working with Daisuke, although no longer wearing her trademark hat. She also insists that she now be called Yuriko, not Gon.

Gon is portrayed by .

Tsurugi Kamishiro