Astor is a side character in Jason's story: Sounds weird, but if this novel was about Jason it would be you usual reincarnation into a hero story. Off handed I mention Jason has a harem, which purely exists for jokes and to poke fun at the harem hero archetype. Astor himself is unlikely to get in a romance.

Funfacts: Astor is still jealous that he can't use Divine Light, so much so he wrote a book slander the church. Mages and Believers of the Goddess have always had strained relations

Think of Finn from Fionna and Cake for Adult Jason

Astor's favourite magic types are creation, enchantment and space manipulation.

Mages often visit Astor's tower to try and meet him. If he finds them worth it, he'll gift little bits of his own knowledge... by throwing stuff out the window.