These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
It's only too easy to see the "preps" as the good guys and the "goffs" as the bad guys. After all, the "goffs" are all utter jerks and we never see the "preps" do anything to deserve the treatment they get. In particular, the fic wants us to see Britney as the Alpha Bitch and Enoby as the Cool Loser. But who's the one judging the other for how she dresses? Who's the one who sits by and takes the other's abuse without retaliating until the end? Who's the one gets followed around by a large group of friends while the other one always seems to be on her own?
"Dumblydore". Is he a "poser" just trying to be cool like Ebony thinks? Is he a brilliant ChessmasterObfuscating Stupidity to manipulate Ebony into destroying "Volsemort"? Or is he just an old, senile guy who does things at random?
When Enoby used the Killing Curse at the end, did she aim it at Voldemort or herself?
Accidental Innuendo: Whether it's actually accidental depends on whether the fic actually is a parody or not, but regular words are occasionally "accidentally" spelled wrong and turned into obscenities, e.g. "Minister of Magic Cornelius Fudge" becomes "Mystery of Magic Cornelia Fuck", "Professor Slughorn" becoming "Professor Slutborn", etc.
Ass Pull: Many examples. At one point the characters need to find Draco (who Volfemort has bondage, whatever that means). To solve this, Vampire "has an idea" and teleports them into Voldemort's lair. Enoby whines endlessly about stuff much easier to solve than this, like choosing between Draco and Vampire.
Author's Saving Throw: It's hard to tell but when Tara explains the fact Dumbledor was calling Ebony and Draco "Motherfuckers" because he had an headache can be seen as an attempt to this.
Designated Hero: Ebony often does things far worse than any of the so called villains of the story. One of the few character traits that actually remains consistent is that she judges your morals by the way you dress.
Designated Villain: Britney doesn't do anything aside from being a "prep". Except in chapter 42 where it's stated by 'Proffessor Trevolry' that Britney freed Snap, Loopin and Hargrid from "Azerbaijan". How or why exactly, Trevolry (and Tara) never goes into.
Ebony saying that she wasn't a slut in chapter ten and then proceeds to have sex in later chapters with a majority of the male "goffik" characters.
Magnificent Bitch: Whoever cracked Tara's password and wrote a final Fix Fic chapter that sorted out all the canon issues and restored logical coherence (or rather, introduced logical coherence) to the story, and who made a valiant effort to Torch the Franchise and Run before Tara managed to return from a "vocation" in "Englond" and "fix" the situation.
Offscreen Moment of Awesome: Given the first-person format of the story, we never see exactly how Britney busted Snape and Lupin out of Azkahbian/Azerbaijan/Afghanistan.
Protagonist-Centered Morality: In spades. Ebony can threat others like crap, call them names without being called out, switch between Vampire and Draco but if the latter cheats on her, he has to apologize.
Romantic Plot Tumor: Most of the plot is focused on a Vampire/Ebony/Draco Love Triangle. Even Voldemort forcing Ebony to kill "Vampire" is treated as though it were simply a complication to all the romantic drama.
Sequelitis: The original is considered by some to be So Bad, It's Good, but most of the parody sequels are just plain painful. No matter how hard many may try, none can match Ms. Gilesbie's literary... um, achievement.
So Bad, It's Good: The main reason to read it is to laugh your ass off at how terrible it is. Nobody's really sure if this was the intent or not, but it's certainly the result.
A surprising piece of evidence that it was intentional: the constant references to My Chemical Romance. Sure, at first glance, they're about as "goff" as you can get. But they constantly resist the label 'emo', and when you listen to some of their songs, particularly "Teenagers", you can hear that they're criticizing people that claim not to be 'mainstream' but are simply conforming to a different norm; that's exactly what My Immortal does, whether it intended to or not.
Another piece of evidence is the subtle mention of Lord of the Rings characters, who were only mentioned briefly in the novels but never shown in the movies. Being able to know that must highlight the fact that Tara (if that's her real name) must have read the actual literature and it's quite hard if you can barely spell or read your own work.
Mary Sue: Ebony. Just... Ebony. Tara denies it (despite many noticeable Freudian slips in which other characters refer to Ebony as "Tata" "Tara" and "TaEbory"), and responds to her preppy haters with this:
I sed stup flaming ok ebony's name is ENOBY nut mary su OK!
Parody Sue: Depends on whether Gilesbie's a troll or not — if so, one of the best examples.
Jerk Sue: She has quite the potty mouth and spends a lot of time yelling at everybody, insulting her friends for no reason, and on occasion laughing at others' misfortunes. But everybody still wants to be around her.
About the only form of Mary Sue which Ebony doesn't fit is Purity Sue/Mary Sue Classic. And even there, she never "soils" herself by having sex with another female despite her claims that she's bi, and she's quick to tell us that because she's a girl she didn't get an erection, you sickos. She's also a valiant fighter for Truth, Justice, and the Goth Way, and will defend the world against the preps with her dying breath — which in the world of Tara Gillespie almost makes her a paladin of Incorruptible Pure Pureness.
Wangst: Ebony's constant whining. And this gem from Draco:
What an Idiot: Ebony/Enoby, despite being told that Draco and Harry were a couple long before Draco and her had "you-know-what", insists on believing that Draco cheated on her. About a paragraph later she has a "brainstorm" and wonders if Draco and Harry dated before she started dating Draco. Whether this is genuine stupidity on Enoby's part, or the result of Tara forgetting what she just wrote, we may never know.