The most obvious of obvious choices, to the point that I've already outright said this is who I was going to be talking about today. π€£ Because I can't help loving this adorable little gremlin.
Just look at that cute little gremlin face! (played by Xiao Zhan)
So...as per most of my other Mo Dao Zu Shi-related posts this month, I won't bother trying to explain the plot of the original novel, and will just give a brief encapsulation of the character and how I've written him in my fan fiction.
Being the lead of the original novel, there's obviously a lot to say about who Wei Wuxian is and what he's like. And I won't do a very good job at summing that up, because I have a tendency to fall flat on such matters. π° Um. Anyway.
Wei Wuxian is his courtesy name, and his birth name is Wei Ying. To describe who he is kind of requires talking about where he came from and how he was raised, so prepare for a long diatribe that MDZS fans already know all the details of. π
His parents are the wandering cultivator Cangse-sanren and Wei Changze, and even before he was born he was already causing trouble, in a way, because his mother's arrival at Lotus Pier made the young Jiang Fengmian (who was either the heir to the Jiang Clan or its young leader at the time, not sure which off-hand, if we even know) fall in love with her, despite that he was already engaged to Yu Ziyuan. We don't have the full story on what happened, but at some point after Jiang Fengmian broke off his engagement Cangse-sanren eloped with Wei Changze (whose position in the Jiang Clan is translated as being a "servant" but I don't think it's quite as low a position as the word "servant" would indicate in, say, a Medieval Europe setting) instead, despite that (or maybe because) both of them were likely 100% aware of Jiang Fengmian's feelings. But then Cangse-sanren and Wei Changze died when their son was very small. (The live-action drama specified that he was four; I don't recall off-hand if the book gave an exact year, but probably in that general age range there, too.) With no relations around, little Wei Ying ended up living in the streets of Yiling and having to fend for himself, including living off of scraps of food out of the garbage.
Around the time he was eight, Jiang Fengmian found him, though by this point he had been living alone in the streets so long that all he could remember was that his name had a "Ying" in it. π Jiang Fengmian brought him back to Lotus Pier, where he raised the boy alongside his own two children, Jiang Yanli (then about twelve) and Jiang Cheng (then about eight), though since he had ended up married to Yu Ziyuan anyway, he wasn't allowed to officially adopt Wei Ying, because she was punishing the child for problems caused by his mother. π° Jiang Yanli took to her new not-quite-brother straight away, but Jiang Cheng was bitter after having his three puppies taken away (because Wei Ying had become deathly afraid of dogs after being bitten by stray dogs so many times as they also wanted the scraps of food in the garbage) and only after nearly driving Wei Ying to run away from Lotus Pier did he finally also accept him as a part of the family. Yu Ziyuan never did accept him, though, forcing Wei Ying to address her husband as Jiang-shushu rather than as his adoptive father, or even as his clan leader or teacher. (Because the teacher/student relationship is an inherently paternal one (in terminology, if nothing else) that would have meant she was accepting a maternal position in regards to the boy if she allowed him to address her husband as his teacher. And she was having none of that.)
However, despite Yu Ziyuan's animosity, Wei Wuxian grew up happy at Lotus Pier, and as soon as he started his cultivation training, he proved himself not only the best of his generation at Lotus Pier, but one of the best his age in any clan. That gave him a decided arrogant streak, on top of his self-indulgent whims, his competitiveness, and general happy-go-lucky attitude most of the time. However, he also has a temper, which at first is only vented at anyone who would dare to insult his precious shijie, Jiang Yanli. After the plot gets going, his temper turns from minor fights with Jin Zixuan to wreaking bloody and sometimes outright horrifying revenge on anyone who dares to harm those Wei Wuxian cares about. In the final year or so of his life (the life he loses at the start of the novel, only to promptly get a new one in the next chapter, though that's over a decade later), he spirals into some very dark places, mentally, and his behavior can be exceptionally off-putting in that period. (Fortunately, that period is a pretty short part of the novel...)
He likes to style himself as a "bad boy" (especially in the second life that is the novel's present, where he seems to delight in the fact that many of his past actions are "nefarious") but he's actually quite dutiful (eg when returning to Lotus Pier for the first time in roughly fifteen years, one of the first things he wants to do is to go to the Ancestral Hall and pay his respects to Jiang Fengmian and Yu Ziyuan as if they were his real parents (despite the way Yu Ziyuan treated him his entire life)) and very concerned with doing what's right and protecting the innocent. He's friendly and outgoing until someone crosses him, and then look out! Up until he realizes he's in love with Lan Wangji, he's a terrible flirt with almost every pretty girl he sees, though he never attempted to do more than flirt with any of them.
Okay, so I think that managed to sum up most of his personality and the situations that led him to become the way he is. So that means I can finally discuss my own attempts to write about him. (Though I still struggle to get him characterized correctly...)