I don't have a drawing available at the moment, but i do want to talk about my favourite kind of bloodswap karkat (/the vantases in general lol), being

Violetblood karkat. (I think we all saw this coming.)

I stole a few violetblood headcanons from my beloved lol

Eri and i hc seadwellers to be cold-blooded, so karkat probably has an extra big sweater instead of the simple one he normally would

Man ABSOLUTELY has a hatred for hemoism, especially in his caste. He hates seeing castes oppressed.

Ngl karkat would have joined (regular!) Signless' movements. He wants to have justice.

Also i just think that karkat as a violetblood in general would be really expressive with his gills being a huge indicator of his mood.

Karkat is still absolutely the piss baby everyone loves him to be, don't worry!

I'd like to think he stayed hemoanonymous because he generally doesn't like how he's such high of a caste.

Tbh karkat is probably really cold to the touch because of his cold-bloodedness.

If it's a bloodswap au where he was a mutant but changed, he absolutely would be freaking out about how he lost his natural heat generator shit

He's standing there freaking out like "OH GOD, WHAT THE FUCK HAPPENED? FIRST, I FIND OUT I CHANGED INTO A VIOLETBLOOD, NEXT, I DON'T EVEN FEEL *WARM?*"

He would probably miss being a mutant if it's one of those bloodswap aus

Also i hc seadwellers to have webbed hands (fuschias having them in full, violets having more of a transparent ish web that does the same purpose, it's just transparent and smaller in size.)

He would probably grab his hands where they're webbed and hold them as a comfort thing

Ngl this post is getting a bit too long and i don't wanna spew THAT MUCH about my violet karkat hcs