A quick list before I leave work. I will come back and edit in more info. This is my ranking of the various main leads in the JY novels, excluding Yue Nu Jian as I don't know who to use as the main character in that one. The list is subjective. I counted each of the three sworn bros as main characters, and Wu Yat Doe as the lead in Flying Fox of Snow Mountain instead of Wufei. Everyone post yours too if you like, and let's compare the difference in taste.
1-YG: The more I thought about ROCH (actually I hardly ever think about it now, but back when I read ROCH I did), the more I liked YG. I agree with most of his actions and can totally relate to and understand him.
2-LWC/LHC: I don't relate as much to him as YG, but I still see lots of myself in the character. So yeah, I am really biased.
3-XF: I really like characters who aren't afraid to kick a$$ when they have to. He had a couple of classic and major characters flaw in that he was too proud of himself and he could not control his anger, but overall he is the Hero among heroes.
4-WXB: If he was really a scumbag, no one would like him, but he's a good guy deep down. Yeah he's a brownnoser and a liar and a rapist, but somehow he's one of those dudes that can steal your wife and you'll still remain friends with him.
5-Wu Yat Doe/Hu Yi Dao: Smart, Brave, Just. What else do ya want. It's a pity he had to die at the hands of a rat. And the dope who inadvertently dealt the death cut (Miao Ren Feng) isn't worthy of him either. I wish there was more story about him. He was already dead in FFofSM but he was cooler than his son so I'll give him credit for being a lead character.
6-Wufei/Hufei: Better spell out the name for him as people may not know who he is. He's one of the few JY characters we actually see being a xia and helping the weak and beating the rich. He couldn't get pass the mei ren guan though, as he got his business messed up by that annoying Yuan Ziyi. Cheng Lingsu died for him, another strike against him, but due to the lack of ethusiasm for the rest of the characters, WF gets #5 by default.
7-GJ: I don't like GJ much, but come to think of it, not a lot of the JY main characters are that likeable. Well, whenever anyone criticizes GJ, his defenders can always throw the "he defended xiangyang" trump card in the critic's face. That's his get-out-of-jail-free card, so be it.
8-Dog Bastard: This is the dude in Ode to Gallantry. His real name is PROBABLY Shi Zhong Jian, but JY never definitively said he was the "dead" son of the Shi's, so I can only go by the name his abusive mom gave him. The kid has a good heart, and he's not annoyingly sissy like ZWJ or DY so I'll rank him 8th.
9-DY: He'd probably get arrested today for stalking, but he's harmless and he's a good guy. I only wish he didn't follow WYY around like a dog.
10-Di Yun: Well, he's not really all that likeable or remarkable, but he's the guy who suffered the most of anyone among JY lead characters, so I'll put him here. There isn't much to dislike about him anyway.
11-Xu Zhu: He's dumb and really po po ma ma, but he's got a good heart. It probably speaks to the lack of choices that he ranks this high.
12-ZWJ: Marshmellow Man. He peaked real early, at Brilliance Peak. After that it was all downhill. Embarrassing.
13-Li Wen Xiu: I am blase about the character. She's nice but she suffers from that curious one-manitis that so many of the JY females suffer. So Su Pu loves someone else, boohoo. Find someone else dummy.
14-Yuan Gwan Nan: From Yin Yang Saber. I am pretty blase about him too. Well, at least he has a good ending. If you don't anything to say...
15-Yuan Cheng Zhi: He had this annoying habit of trying to make people behave by letting them know that there are mountains beyond mountains. Not surprisingly, his victims just got more pissed LOL. He's ok, but he's like those credit card application spam you get in the mail, you just toss it in the trash.
16-Chen Jia Luo: Last and certainly least. I enjoyed rooting for Chienlong against this moron. He sucks. No JY character has been given so much and yet failed so miserably. AND he survived! Grrrrrr.