Some of my personal favourite sirius headcanons cos hes just my favourite lil guy:
- He was one of those kids that had to have a leash in public because he was a little menace
- gets distracted very easily, like he goes through about 15 different topics in about 2 minutes of conversation and remus has absolutely no idea what he's saying most of the time but goes along with it anyway because he is completely smitten
- he sees any sort of personal disability as a weakness. For instance- he could be going blind/deaf and absolutely refuses to get any sort of aids for it, and just tries to ignore it. Remus and james are planning an intervention.
- never learnt how to tie his shoes so the laces are permanently undone and he's constantly tripping over them- he says it 'looks cool'
- genuinely a child prodigy, he can speak like a million languages and can play all the instruments and never has to put in any effort at school- this leads to him basically skipping all his classes and skimming a textbook the night before an exam and still getting top marks.
- he sees Minnie as a sort of maternal figure and in the younger years he would deliberately act out on purpose to get her attention, eventually she told him that he can talk to her at any point without getting in trouble and now they have tea every Saturday and talk about their weeks.