Yozora

Yozora is a video game character in the Vernum Rex game series that exist only in the world of Toy Box.

Kingdom Hearts III
Yozora appeared during the commercial that was played in Andy's Room where Rex was watching. In it, it reveals that his game was coming out today and reveal what kind of world his was like. When Sora, Donald, and Goofy appeared unto the world, Rex believed that Sora was Yozora due to their similar clothing.

Yozora
During the Secret Ending Movie to Kingdom Hearts III, Riku woke up in a strange modern city, with Yozora, revealing to be real, was watching over him.

Trivia

 * Many fans believed that Yozora and his game were based around Tetsuya Nomura original idea for Final Fantasy XV, back then when it was called Final Fantasy Verus XIII
 * Nomura once stated before that Noctis, Final Fantasy XV main character, has some connection to Sora, but with some opposite traits, a sign that Yozora and Sora holds a connection.