Blackspark spends a fairly considerable amount of his time around other people trying very hard not to start petting audial fins. He really likes audial fins. It’s not a kink, it’s just that “ooh pretty I want to touch” sort of thing. He will happily work it into sexy times if requested, but mostly he just wants to stroke.
Gravescratch, when sufficiently excited while in alt mode, will do a canine playbow at someone, yap, spin around, and run off to do whatever he was doing. He very rarely lets himself go like that, he loathes being seen as an animal, but people like Blackspark understand that mannerisms don’t make him an animal. He’ll be downright goofy around Blackspark when in the right mood, whining and pawing and wagging his tail like crazy.
Sharpshot’s primary optic assembly is slightly looser than usual due to being able to extend out into the main structure of his scope. It can, under unfortunate situations, get grit in between the large lenses. His response to this is extreme distress, understandably, and extending the optic structure to get it cleaned out whenever he’s in somewhere safe. It’s an incredibly strange look, his optic lenses telescope outwards into thin air and a gush of trapped optic lubricant drips down his face, but it works to get it cleaned out. Can’t have grit rubbing around in there when the lenses shift, of course.