Because you like Unnamed in Fight Club
Sometimes being a supportive girlfriend like Ophelia doesn't work out too well. See them in Hamlet.
Ted Logan wants to party on, but if doesn't get an A+ on his history presentation, he'll flunk out and be sent to a military school in Alaska. See them in Bill & Ted's Excellent Adventure.
Basil Hallward is dominated, soul, brain, and power by Dorian. See them in Dorian Gray.
If the awesome Andie Walsh is from the wrong side of the tracks, we don't want to be right. See them in Pretty in Pink.
In the Land of the Dead, finally free from the restrictive customs of Victorian society, Victor Van Dort is coming out of his shell. See them in Corpse Bride.
Give in to the dark side with vampire Lestat; it's more fun. See them in Interview with the Vampire: The Vampire Chronicles.
Despite the war-torn world around him, Mal Reynolds still holds onto the shred of hope that life can be more than just living another day. See them in Firefly.
Honest, true, and just, Ned Stark is a good man. Unfortunately, those traits are not assets in Westerosi politics. See them in Game of Thrones.
The witty Aku would be an ideal dinner guest, if he weren't a demon. See them in Samurai Jack.
Prideful and psychotic tendencies combine to make Dr. Eggman a dangerous and villain who will squash anyone in his path. See them in Sonic the Hedgehog.
Suzy Bishop is only 12, but her withering stare and withdrawn personality are enough to make anyone wilt. See them in Moonrise Kingdom.
Lily Aldrin is a flaky but supportive kindergarten teacher and painter. See them in How I Met Your Mother.