I wanna get in on the whole JazzNight
Okay so what if GoN decided to use his power to be reborn in the mortal realm before locking it up, but not only he locked up his powers, he also locked up his memories.
Reason is probably because their might be conflict or war in his realm and after hundreds or thousands of years he probably grew tired of it, thinking that it could go on for eternity is just unbearable.
So he disappeared, sealed up his powers and memories and is reborn as a human. And then years passed, he's an adult now, an astronomer because he's fascinated by, well everything.
And then one day, someone keeps showing up day to day, just wanting to talk to him and all that stuff not knowing this someone is kinda his mortal rival (and also someone he loves) the God of Jazz.
Just the mental image of GoN going "I'm too tired of this shit" and yeeting himself down to Earth only to get rage-baited by GoJ is hilarious lmfao
And hear me out on this, GoJ keeps showing up because 1. The other gods want to ask GoN to come back and sent him to ask him back but he realized that GoN doesn't have his memories, and 2. He's now watching over GoN and making sure he's okay. They may be rivals (I feel like they're not rivals, more so disagree on some things but get along in others) but they do check in on each other every once in a while to make sure that they're okay.
Also, I personally imagine GoJ with a Hermes-like personality. If you've seen Troy's (the va/singer for Hermes in EPIC) videos, he captures Hermes's personality like down to a T and that's how I imagine GoJ acts.