Sorry for the wait lol, but heres Sun!
Sun is a fallen angel that made a pact with a powerful trapped chaos goddess to maintain his powers and original form, although for keeping his form it was unneeded due to him only looking “corrupted” was a mental issue not an issue of him being fallen, but the deal at least stopped it from progressing even with his mental state
As a part of the deal he was free to as he wished but if she called for him, he would have no choice to obey and do as she said, which is how he ends up being Tari’s guardian, unaware, Tari is the perfect “host” and gateway for the goddess to free herself, but she needs her alive for that, who better to keep her safe than a high ranking fallen angel under her command until the time is right, even better when 2 other powerful entities enter the picture and fall for her as well, all the goddess has do is wait
Sun is a very charismatic asshole who loves to cause mayhem, a coping mechanism since his chaotic personality was what got him kicked out in the first place, not because he was causing any harm, but simply that his chaotic and joyful personality did not fit the ridged norms and laws and he would unbalance and corrupt the others, better to cast him out than risk trouble. But he is a kind sweetheart, just simply afraid of being hurt for being himself, he’d rather mask and play the part of what heaven believes him to be
He does soften as time passes with Tari and the other 2, slowly realizing he can drop parts of the mask, at least around the 3 of them, doesnt mean his nasty personality gets him trouble, both with Tari and the goddess since he loves to push boundaries but he gets better
Tari likes to call him Rays, disco ball, crystal ball (even waving her arms around his head like shes getting a vision), or just calling him a giant walking nightlight, he acts huffy about the nicknames but he secretly likes them, they may be teasing but their friendly
When others come over he disguises himself as a barn owl, Tari even putting up a wooden bird house for him. He does use it at times, he likes being high up in a little box, offers some comfort for him when he just wants to relax or have some space for himself