|Transformation Item||Beam Flasher|
|Home world:||Planet Earth (U40 Timeline)|
|First Appearance:||The☆Ultraman Episode 1: Birth of a New Hero|
|Last Appearances||The☆Ultraman Episode 50: To The Ultra Star! Conclusion: Towards Peace and Victory|
|Affiliation||Scientific Defense Guard|
People of U40
|Portrayed by||Kei Tomiyama (Voice)|
The hero of the story, stationed on a space station watching over Earth, Choichiro got a bird's eye view of the strange phenomenon that happened in Earth's sky. Dispatched to the Scientific Defense Guard, on his way to Earth, he encountered a red light and in a dream-like vision fused with Ultraman Joneus. Dismissing it as a hallucination he continued to Earth and met up with his team.
Later his theory was proven false as a voice instructed him on how to transform and he switched with Joneus to defend the Earth for the first time. Since then, whenever he had the chance in battle he transformed into the Ultraman, keeping this fact a secret from his team.
- Combat Training: Choichiro is a trained marksman and combatant.
- Piloting: Choichiro is skilled in piloting rockets and fighter jets.
- Transformation: Choichiro can transform via the Beam Flasher.
- Choichiro is the first animated protagonist.
- Choichiro is the second Showa Ultra's human hosts only appears in one series and was never seen again. The first was Kotaro Higashi in Ultraman Taro.