I don't use Luna (Chandrakala's daughter & Midnight's twin) as much, but I still find her to be an interesting character.

Luna's father, Conan was slaughtered by a vampire when she was younger. Both Conan and Luna were exceptionally close, so this event completely shattered her. Along with being emotionally scarred, Luna grew to despise vampires and all creatures of demonic descent.

Taking after her father and becoming a Christan, Luna also took up something else - she became a vampire/demon huntress, vowing to exterminate all demonic creatures. She says she does it for the revenge for her father, and also in the name of Christ.

Along with that, Luna has grown to despise her mother. She hates the fact that she mingles with demons so freely. In addition, she finds the fact that she's in love with Nathaniel and Maralyn to be horrendous. She especially despises the fact that Nathaniel is so much like her own father.

Although Midnight loves Kira and soon marries Ezra, she does not hate her brother. Even though she is younger (by five minutes) she has always been Midnight's protector. She simply thinks he's blind to what "they really are", and will never put him down for loving them.