Former NXT Superstar Daniel Bryan
Daniel Bryan appeared on the inaugural episode of NXT back in 2010. This was when NXT wrestlers had mentors, and Bryan's mentor was none other than The Miz. These episodes of NXT (and a Talking Smack argument) would have wrestling fans talking about a Daniel Bryan vs. The Miz match for years until we got it at SummerSlam 2018.
Since returning from a career-threatening injury, Bryan became WWE Champion, SmackDown Tag Team Champion, and competed for the Universal Championship at WrestleMania 37. After losing to Roman Reigns in a championship vs. career match, Bryan has not been seen on WWE television.
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While there are reports that Bryan is no longer under contract with WWE, WWE has yet to come out and officially say so. Bryan coming back as NXT GM would be a full circle story, as an original NXT competitor is back to being GM on the show. Bryan was also SmackDown GM after his injury, and did well with what he was given.
Daniel Bryan embodies the very essence of NXT, so having him as GM would be a very welcoming sight.