Meiling is not only Syaoran's cousin, but also his fiancé. She's rather obsessed about the latter and worried that the other girls are out to steal Syaoran; Sakura in particular. Part of this most likely has to do with Meiling's lack of magical power. It's unusual for a member of the Li family to be born without magical ability, but Meiling was. Seeing that Syaoran has discovered a girl their age who possesses a good deal of such ability is not only chaffing, it makes Meiling concerned that Syaoran may see Sakura as being her superior. As a result, Meiling becomes very competitive with Sakura. Everything they do, Meiling seeks to outperform Sakura - gym class, the school marathon, even hunting Clow Cards (despite her inability to fight them with magic or sense them). She's very insecure, especially since Syaoran left her unexpectedly to go chase Clow Cards and the very first time she sees him, another girl (Sakura) is wearing a shirt she bought for him as a present.

Nonetheless, Meiling does manage to be friendly with Sakura upon occasion, when she's not caught up in trying to prove something. She demonstrated how to open hazelnuts to Sakura and Meiling (though some might argue that this was just an attempt to show off superior knowledge). However, her attitude (not to mention her relationship with Syaoran) does not earn her much respect from Kero, who refers to her as "Little Girl." Sakura and Tomoyo are tolerant of her, and while they do try to be accepting of her, Meiling makes it hard for them to like her because she is constantly shooting Sakura evil looks and trying to belittle her accomplishments.

While she doesn't have magical ability, Meiling does have a number of other abilities. She's very good at gymnastics and is training in the martial arts. She attacked The Fight card when it defeated Syaoran and she discovered Sakura did not know how to fight. She's also a very fast sprinter, though she doesn't run long distances well at first. One of her more redeeming qualities is a willingness to listen to the adivce of others - once she has determined she can't do something. Of course, sometimes this takes a few failures before she admits she needs the help.

Some may argue that Meiling is nothing more than a brat. I happen to disagree and find her to be one of the more interesting characters in the show. For all of her bravado, Meiling's self esteem isn't very large. All of her gusto is an attempt to cover up her inner worries that she isn't good enough. After all, it can't be easy to grow up lacking the trait that makes her family so important. Yes, she runs headlong into things, but frequently it is out of a pure desire to help Syaoran. She feels the need to prove herself to him and is always trying to impress him. Somehow she can't see that he does honestly care for her (evidenced by how often he tries to protect her from any sort of harm and how he was upset when he saw Sakura wearing the T-shirt Meiling had given him).