Who loves himself the most ? In a good way . And who needs to ?
While I do think everyone goes through periods where they might love themselves a little less, I think Kun is really comfortable with himself. I get the vibe that he feels happy with who he's grown up to be. Johnny feels like his self-love has been something hard but necessary to achieve. Jaemin feels like someone accepting of his own flaws, which is a type of self-love, in my opinion, and Taeil gives me a laid back feeling, like, of course he loves himself. To name a few more members: Yuta, WinWin & YangYang.
I think every member can stand to love themselves just a little bit more, even the ones I named above. As always, Jisung is at the top of the list. He's still young and learning to not worry too much about his weaknesses. Renjun lacks a lot of confidence, but I don't think it necessarily translates into the love he has for himself. I still get the feeling like it's something he struggles with, though. Lucas, because I think he's harsh on himself sometimes. Hendery, too.
Honestly, none of them fall into strictly one category. There are a lot of gray areas in this question. It's easy to love yourself one day and not be so satisfied with yourself the next. Then, you also have to deal with the fact that loving yourself looks completely different for everyone.