A fursona is just a fictional anthropomorphic character. They might be a representation of the creator, an idealized view of what they wish they were, or just something they like. There's no real guidelines for what they have to be or how they have to be used; when someone has an interest in a fandom which is based in fictional characters with certain characteristics, the logical next step is to create one or more of those characters of your own design; that's all a fursona is.

It just sent me because OP's description of their D&D character:

Nah, he’s just cooler than me. Funnier than me. Stronger than me. Nicer than me. Also he has a shadow version of himself he can summon and has a talking moose named Sailor so… And who the fuck doesn’t want to fly?

is basically exactly what you'd hear from some furries describing their fursonas, and the expressed desire to be that character is also a pretty common furry trait, as is the commissioning of art of fursonas.

Didn't mean any offense by it if OP doesn't wish to be identified as a furry, the parallels just struck me as obvious and funny.