I love Magrat. Because, yes, she's soppy and frilly and ridiculous -- but she's a real person at least as much as a caricature, and you find yourself caring about her instead of just laughing at whatever silliness she's embraced now. (And once in a while, the silliness is right, or at least part-right.)

That's one thing I think Terry Pratchett does really well, very often, is taking joke characters and making them human. Oh, the joke stays, but it turns into affectionate facepalming at a friend rather than just laughing at the Comic Relief Character.