While not appearing in My Immortal proper, Luna Lovegood is the primary antagonist of Ghost of You and a minor antagonist in I'm Not Okay, henceforth rendering her a character in the My Immortal mythos.
Role in the story[]
Maya (formerly Hermione) is listening to "goth" music, prompting Luna - up to that point giggling with her prep friends - to ask the ever iconic:
"Oh my like god, what are you, like, listening to?"
This infuriates Maya, who gives her the middle finger, greatly shocking Luna. Then she disappears from the story, presumably having better things to do.
In I'm Not Okay, she's still a prep but is friends with Hermione, who has also been rendered as a prep (a stark contrast from her gothic transformations as either B'loody Mary Smith or Maya). They're easily scared off by the gothic clique that Eternity has just met.
Appearance[]
She looks "exactly like Hillary Duff". It seems that Tara decided that since she has blonde hair, that automatically makes her a prep.
Differences from the original[]
In the books, Luna is basically the polar opposite of a prep, being highly unconventional and shunned even by other Ravenclaws due to her weird beliefs (such as subscribing to bizarre conspiracy theories and searching for non-existent creatures) and habits (such as going around school barefoot and preferring to read upside-down). She was also quite self-absorbed, prone to being so wrapped up in her own thoughts that she paid little attention to her environment or what others were doing, had extreme difficulty making friends, and treated everyone with extreme tolerance - not the kind of person to giggle in groups or inquire mockingly about someone's musical taste.
In either story, the lack of character development means that her character in this version is flat, missing all of her personality and quirks, losing all resemblance to the original character, without replacing it with any alternate personality, besides "prep".