(brief note that I haven't actually read most of the LWJ parts of MDZS, and with CQL I've mostly only watched the LWJ parts the once—)
How I feel about this character: :|, perhaps fittingly. I am definitely fonder of the MDZS version, though!!
All the people I ship romantically with this character: WWX! I am honestly pretty boring about shipping in this fandom, and the Lans are...welp.
My non-romantic OTP for this character: hmmm. LXC, I suppose? It's certainly one of his very most important relationships, and of course it matters tremendously to LXC too—that said I will admit I am not particularly interested in it beyond its importance to LXC... LWJ and the juniors, maybe?
My unpopular opinion about this character: just the one, huh. hmmm. Contra a lot of JGY fans, I think my least favourite MDZS to CQL change is LWJ becoming xiandu at the end. I think a lot of the 3zun is...hmmm, how can I put this. The arcs work less well thematically, but they hang together pretty well, and although a first-glance reading can tend to favour "oh JGY is just the evil bad guy" I think a closer examination reveals that it's actually a lot more complicated than that—e.g. people taking the NMJ Empathy scenes as what "actually" happened, when of course they are in fact a very distorted version of events. On the other hand, while a lot of the ingredients of a rather complicated political scene which LWJ is very much not equipped to handle are still present, we're not given any complicating follow-through and it very much reads as though...uh, it's not going to be at least one of a major disaster or a significant complication of LWJ's moral perspective and shit...anyway.
One thing I wish would happen / had happened with this character in canon: okay, for CWL LWJ, I really wish we'd seen more follow-up in his relationship with LXC? In particular—okay, so in MDZS I do think he fucked up by leaving LXC in the courtyard. HOWEVER, I think it's a lot more understandable than in CQL? like...MDZS LXC is very definitely not doing well, at all, but CQL LXC just TRIED TO STAY AND DIE IN THE TEMPLE. come on, my dude!!! And especially given his whole, you know, righteousness thingy....man. And then in MDZS we hear about him being badly off, and we see him in the banquet extras...I could be misremembering but I don't think we do see any of that in CQL! Now it is true that in CQL LWJ seems to return to CR a lot faster, so there is that, but the way it's presented it seems like it's all about responsibility to be xiandu and none of it is about. You know. HIS BROTHER. Which doesn't mean obviously that there can't be some of that going on but, I imagine he must have some kind of relationship with the fact that his brother is so thoroughly completely broken but we don't see it!!! Bah!!!!!!
Obviously this ties in with my unpopular opinion above, but yeah, I'd love to see CQL LWJ... actually having to deal with this... Or conversely, for MDZS LWJ, I wish we could see what exactly happened in the Twin Jades interactions in the Banquet extras!! Not in an "I'd change the text to make this happen" way, I'm just extremely curious.