Zack Fair has always been one of the most important characters in Final Fantasy 7 despite being dead at the start of the game. As the Remake trilogy gets ready to end next year with Revelation, the team at Square Enix is planning on making Zack an even bigger part of the climactic finale.
Series director Naoki Hamaguchi revealed in an interview with Japanese outlet Denfaminico that Zack's screen time in Revelation is, "even greater than before." While he didn't show up that much in Remake, Zack had a big part to play in Rebirth, including several sections where he was a playable character. His inclusion in Rebirth leaned into the idea that the Remake trilogy is a multiversal story.