i pay a lot of attention to what the members say about him and how he behaves with them in logbooks, interviews, etc! sh has described him as "too kind to where he'll let others treat him badly", hj has said that he "needs a little more care than the others" and things like that! he's also incredibly smart, and has said before (i cant find the source) that he looks at people as if he wants to memorize them. sn has said that yeosang is super kind as well. so taking those into account is a really good way to characterize him, while turning him into a villain, as an "extra", or as getting in the way of another ship is a kind of big deterrent imo! he's also someone who you have to repeat things two or three times to to make sure he gets is/understands/has heard you, and is incredibly silly. he isn't someone who hates skinship (if you watch videos from their rookie years, he's always hanging off of sn and would seek sn out for comfort a lot of times), so the way he acts when sn or wy or sh tries to kiss him is all for dramatics! (personally, i think he just doesn't like the sound of the kiss so close to his ear, not the act itself)

for my own personal touches, i like to project my autism and adhd on him, and put my own experiences into his character. he displays a lot of ND tendencies so it's really easy to project onto him!

if you want me to expand on any of these lmk <3 i love talking about ysng a lot