Shin Hayata

Hayata is a military officer in the original Ultraman series.

History
Hayata was investigating a swamp that the monster Bemular was hiding in. But Ultraman crashed into Hayata's ship. Ultraman, ashamed of what he did, Ultraman merged their lives so Hayata wouldn't die. He gave Hayata the beta capsule so he could transform into Ultraman when the time was right. After a year of fighting, he and his team were countered by the Zetton race and they released their super soldier to destroy the science patrol, then proceed to take over earth.

Ultraman Mebius
He appeared on Episode 47, where he helped Ultraman Mebius defeat the Alien Mephilas. He later appears in the ending watching Mirai Hibino walk away with a memeber of GUYS.

Ultraman Mebius & Ultraman Brothers
Shin Hayata appears in this movie, he is shown to work as an airport administrator in Kobe's airport. After Mebius' battle against Alien Temperor, Shin Hayata reveals himself to Mirai Hibino, and after a short conversation, Hayata, along with Dan Moroboshi, Hideki Goand Seiji Hokuto, had a conversation about what it means to be an Ultraman, why they stopped being one, and they told Mirai the history of their final battle against Yapool, who they could not destroy and they had to seal him in the sea close to Kobe with the Final Cross Shield, which costed almost all their energy and made them unable to transform, and why they decided to live in Kobe. A while later, Hayata and his other three brothers were looking at Mebius' battle against Alien Zarab, and they saw when Mebius was defeated and crucified by Alien Guts, which gave them no choice but to transform again into their Ultraman forms to save him.