Sirius has always been my favourite character, although I've tended to write more from Remus' POV in the past. I don't have much in common with either of them, but I've been more anxious about writing from Sirius' POV because he's so much cleverer than me. It's easy to show intelligence from a third-party POV because you can just observe them doing some impressive magic or something, it's harder to convey that mental process.

Still, despite not being much like either in canon, I do read a lot of fiction, overuse sarcasm, and might fight you for chocolate, so my fanon Remus game is A+. I even have a tattoo of Canis Major. ;D