Eclectic anon here. Gaius has red hair. His clothes are really old and he almost certainly didn't buy them. He must be a Weasley.
omg yes Gaius’ personality would fit in so well with the Weasleys!! With so many siblings, it makes sense that he’s had to learn to fend for himself somewhat/no one would notice if he slinks off to steal Percy’s desert.
I also kind of want this for him?? because, while his backstory in Awakening isn’t super well-developed, we know that he did not have a lot of resources. I personally think that that his conversations with Maribelle indicate he did not have a family or safety net from a relatively young age. If he’d had Molly and Arthur as his parents…. well, they might not have had a lot to go around, but he would have always had food, and love, and people to turn to when things got difficult.
DAMMIT now I want to write this…. I’m picturing him as being older than Ron but younger than the twins… Fred and George would take him under their wing and have him steal stuff to facilitate their pranks… Molly would teach him to bake… Charlie would help him sort out his babygay feelings… But this raises so many questions!! Would he be a Gryffindor? (Is Chrom Harry? There are some strong parallels there.)