okay so, actual question this time. how much of the post credit snapchats do you consider canon? (im sorry if you have this answered somewhere im on mobile and it keeps fucking me over)
I consider any part of Homestuck not done by Hussie to be semi-canon.
Guest artists are going to have their own biases and preferences reflected by their art which I feel is a product of but also goes against Homestuck’s ideology that all the characters are essentially blank slates that the readers can interpret in any way they like.
Instances of Guest Artists using personal interpretations of characters (in these cases Karkat) can be seen in Collide and Game Over. In Collide when we see Karkat dual-wield sickles, but that’s the only time we ever see him dual-wield. Or in Game Over how Karkat is animated having short sleeves when we have always seen his outfit having long sleeves.
Like Steven Universe, Homestuck allows its art team a full range of creative control with how they draw characters, and there’s nothing wrong with that, it just lets certain content get into the comic that wasn’t laid out by the Huss-man himself.
So to answer your question on how much of the credits/snapchat content I view as canon; All of it, in varying degrees.