Her first name is never spoken in the film (according to the novelization, it's Susan).
Before the Practice Kiss, she even says to Keith: "Pretend I'm a girl." They apparently knew each other since before school. Just Friends: Keith and Watts, for most of the movie.See Manipulative Bastard for how he gets away with it. Jerkass with a Heart of Gold: Duncan, Keith's skinhead/biker friend, is actually quite nice and polite and does his best to look out for Keith and Amanda.Jerkass: Hardy Jenns ("With two 'N's!").I Want My Beloved to Be Happy: Amanda telling Keith to go to Watts in the end.In the book, it's explained that she told him she was a big fan of the band who was playing. One annoying plot hole is also filled in by the novelization: in the movie, we have no idea why Keith is waiting at a club in the hopes that Amanda will show up.Also, her parents are both dead and she lives with two neglectful older brothers. According to the first draft of the script and the young-adult novelization, Watts's first name is Susan.All Love Is Unrequited: Watts, who is in love with her best friend Keith, who is in love with the rich girl Amanda.Keith is humiliated when he borrows it to give Amanda a ride home, and it won't start. A-Cup Angst: Watts jokes how she got "lucky" and never got big breasts.Some Kind of Wonderful had a surprisingly good (but hard-to-find) young-adult novelization that really fleshed out the characters. The film is similar to Hughes and Deutch's previous collaboration Pretty in Pink, with genders switched and the ending changed.