The easy, bias-goggles answer is Joshua, because I love him, but I also find it difficult to characterize him sometimes? So writing him is half "ugh I love him" and half "okay but is this right???? WOULD HE SAY THAT????"

I think overall I most enjoy writing Seungcheol? This might be recency bias given that I wrote a 50k fic about him lol but he is also in my bias line and I find him a lot more straightforward to capture, and plus I am a sucker always for a paladin-type character and Seungcheol slots very easily into that imo. To me he's pretty straightforward and I relate to him a lot, so that makes it easier on me as a writer as well.