hehe thank u😳 omg i just answered an avenpaz related headcanon (about topaz convincing aven to name the cat cakes) but i will try to think of a few more

• aven and topaz love to follow celebrity gossip together (theyre both kpop fans) topaz pretends like she doesnt care but as soon as her ult group is involved in a dating scandal shes like HUUUHHHHHHUUAGHH anyways she and aven probably have the equivalent of a conspiracy board on who’s dating who
• they like to have sleepovers tgt even before they start going out, they’ll do each other’s makeup and paint each other’s nails and topaz will commiserate about the latest in a string of bad hinge dates (whatever the hsr equivalent of hinge is) while aven pretends he doesn’t wish he was dating her instead
• topaz cries when she first finds out about aven’s past and aven has to comfort her and she feels bad bc she should be the one comforting him. so she cries even more (shes me im a little crybaby…..) but it’s just endearing to aven bc he never imagined someone would care so much about him, and also feel sympathetic for him rather than blaming him for everything that happened (since he’s been blaming himself all along)
• i imagine they have a lot of common ground with having a rough childhood and no longer being on their home planet, but aven’s story probably inspires topaz to take a bit of time off and visit home, which in turn inspires aven to try to learn a bit more about his culture since he’s the only one left after all
• also at any given time im always thinking about trans aven or trans topaz or both. t4t so true. theyre bi4bi too but if you follow me you already knew that