I've interacted more with Karkat than Sora so far (I think she's talked to Sora a grand total of once?) but from what I know Sora is IC and interesting, and hopefully I'll hit him up again some point in the future. Karkat has more interaction for sort of obvious reasons, and I've really enjoyed your Karkat! I think you've got his voice down, which is kinda hard to do with Karkat because he's so...wordy? In a very special way. It's always fun to talk to him because of that.