this is more of a homestuck fandom history question, can i do that? has there been major fights over the race of the kids / has hussie ever semi-confirmed the race of a kid (i know that dave, rose and roxy have all been confirmed to be blondes)

oh my god, yes there have been major fights over the kids races. People would argue about that for days pre-gigapause.  It was so bad. People used to defend their headcanons to the death, so bad. Now people don’t care that much and get that headcanons are just headcanons and it’s okay for people to like different things.
Hussie has stayed mostly neutral on the topic except for a few jokes here and there. While the lalonde have indeed been confirmed blonde, I can’t recall any canon proof for Dave.