Teppei is one of Daichi's childhood friends. Daichi is in fact his only friend, as the boy was the only person to not fear his otherworldly abilities, such as being able to create a rainbow ring in his hand. He is, in truth, the human form of the Kill-T-Gang known as Albion and is called "Alaya" by other Kill-T-Gang members. The genes for his "Designer's Child" human body were provided by a man named Eiji Arashi, who was in stasis on the Tenkaido station before escaping.
Teppei's Ego Block is eventually destroyed, leaving him a normal human. Though he loses the ability to become Albion, he gains his own Livlaster, which he uses to power up his own mecha, the prototype Nebula Engine Impacter. His Machine Goodfellow unit, the silver-colored Aramusha, is converted into the Nebula Engine Ordinary component robot. Like Daichi, Teppei is now referred to as a "Neoteny" by the Planetary Gears.
Teppei wears a blue flight suit when on missions, matching the paint scheme on the Nebula Engine.