Kengo Utahoshi

Kengo Utahoshi (歌星 賢吾, Utahoshi Kengo) is the lead supporting protagonist in Kamen Rider Fourze acting as the partner for the lead protagonist, Gentaro Kisaragi. He is also the original owner of the Fourze system until he gave it to Gentaro to become Kamen Rider Fourze due to his weak health. He is however able to use the Powerdizer powered exosuit to assist Fourze in battle, but only for a limited amount of time.

Pesonality
Kengo is a loner with a strong will and wants to defeat the Zodiarts in revenge for the death of his father. Because of this, he tries remains distant from people to not get them involved. Kengo does however accept help from Yuki Jojima and Gentaro after some convincing. He is willing to go to lengths that puts him and his health in danger which limits his actions.

History
Kengo's father was an OSTO scientist who devised the Astro Switches seventeen years prior to the series; before the space station he worked on was destroyed, taking Kengo's father with it. Years later, Kengo by chance finds a secret locker in Amanogawa High School that holds a Cosmic Energy-based portal to the Rabbit Hatch.

Role in Story
Kengo is a second year student at Amanogawa High School who is physically weak but has a strong will. Upon meeting Gentaro and an encounter with the Orion Zodiart, he gave him the equipment to become Fourze such as the Astro Switches and Machine Masshigler and acting as his tactitian.

Abilities
Kengo is intelligent by manner unrelated to school work, having a vast amount knowledge of the Astro Switches and the Powerdizer which is useful in battle. Unfortunately, Kengo alone is highly unsuited for combat due to his weak body which prevents him from using the Fourze System. To compensate he uses the Foodroids and the Powerdizer to fight, but even then using the Powerdizer for a long period of time is an extremely difficult task for him.

Etymology
Kengo is named after Takeshi Hongo, better known as Kamen Rider #1. His name being an anagram for the Rider's identity (Takeshi Hongou; Takeshi Hongou). Also, his surname Utahoshi contained the kanji "星", which translates into "star" to fit into the space theme of the show.