Originally a 300 Series Shinkansen bullet train, Nozomi gains a robotic form empowered by mysterious cosmic light to defend Earth against alien threats like the Blatcher gang's Operation Darkness. As the primary protagonist, he embodies high energy, kindness, and a strong fighting spirit. His combat relies on sword-and-shield armaments, initially the solar-powered Hand Sword and Sun Shield for his Sky Sunday attack. This sun dependency creates vulnerabilities during darkness or bad weather, limiting his effectiveness. Subsequent upgrades overcome this weakness: the Sky Sword and Star Shield enable the Stardust Stream technique, firing violet star-shaped beams without sunlight. Further enhancement via the Perfect Shield unlocks the more powerful Perfect Sky Sunday attack. Mid-series developments reflect significant growth, requiring transformation at 275 km/h with increased energy demands after returning to Earth around episode 105. Nozomi demonstrates leadership in collaborative efforts, notably combining techniques with ally Tsubasa in episode 108 to defeat antagonists. Beyond combat, he hosts promotional content for related toy lines. He appears in the sequel series *Denkō Chō Tokkyū Hikarian* in a supporting role, contrasting with the new protagonist Lightning West. His absence as an active character in the sequel leaves his post-series whereabouts undisclosed.