Basic Trope: A human transformed into a monster chooses to be a monster.
Straight: Wendy is bitten by a human-eating werewolf and just barely escapes with her life. After her first transformation she decides that she enjoyed it so much she also wants to be a cannibal werewolf.
Exaggerated: Wendy descends into full on super villainy and cackles about preying on the fat “cattle” that are her former friends and family.
Downplayed: Wendy is a little more aggressive and callous after changing but not outright evil or murderous; and it takes a full season for her to eventually pull an evitable Face-Heel Turn.
Justified: Lycanthropy is The Virus and/or carries an Enemy Within that makes it impossible for Wendy to avoid being or doing evil.
Inverted: Wendy was a sociopathic monster before being bitten, and the addition of a wolf spirit actually mellows her out by putting her in contact with nature and emotion.
Subverted: Wendy is bitten by a werewolf, but she gets a Protective Charm that stops the curse from making her evil.
Double Subverted: … only for said charm to actually make her a Monster Lord with enough wiles to become The Mole.
Parodied: Wendy starts to laugh evilly about her new power… only for Wendell to hit her with a rolled up newspaper. “No, bad doggie! No transhuman treachery!”
Zig Zagged: Wendy starts acting evil and villainous after being bitten, only it turns out she was already harboring evil tendencies and was just wating for the time to let them out, but an Alternate Timeline shows that had she not been bitten she’d have become an altruist.
Averted: Being bitten by a werewolf has no effect on a character’s morality.
Lampshaded: “What am I going to do Wendell? It’s just a matter of time before I turn into giant evil skanky slut— oh damn it, I’m going to have to wear high heels and tons of hair products and makeup.”
Invoked: Wendy always wanted to be rebellious and power mad, and being bitten by a werewolf gives her a “free pass” to jump off the slippery slope without it being her fault.
Exploited: Wendell realizes that Wendy will become evil after being bit, so he puts the idea in her head that for her to reach her full power she has to kill her sire… which thanks to No Ontological Inertia means she’d be curing herself back to her good normal self.
Defied: Wendy knows everyone bitten by a werewolf turns evil, so she resolves that even if she doesn’t have a choice she will treasure and obey her friends and family because their loyalty, moral compasses and long term planning will stay true and help protect her better than whatever werewolf originally bit her.
Discussed: “The problem isn’t that those bitten by werewolves turn into monsters on the full moon, but that they stay monsters inside their human skins the rest of the month.”
Conversed: “It’s kind of weird, werewolves and vampires are essentially zombies in that the minute they’re turned they become enemies of mankind even though they’re still mentally ‘human’.”
Implied:: Only villains or evil people are bitten, but they all come out of it noticeably eviler.
Deconstructed: Lycanthropy takes away free will by making the cursed turn evil, which metaphisically kills the afflicted. They are, essentially, walking and talking corpses/coma patients and thus the friends and family don't feel conflicted about killing them; it's just a homicidal shell of their loved one.
Reconstructed: Lycanthropy affects people two ways: it makes them acutely aware they’re now a different (better) species, and it alters their psychology. Both of these don’t forcibly turn people evil but they do put them in the mindset of Neanderthal versus Homo Sapiens: them or us. It takes a lot of effort and ethics to resist this pull to speciesism.
Plotted A Good Waste: The morality change plays a huge role in the story, similar to They Look Like Us Now and the villains turning key protagonists. There’s one character who is bitten early on but manages to suppress the physical changes, becoming a heartbreaking mole and focus of a Wham Episode.
Played For Laughs: The werewolf who bit Wendy gives her a gift bag that includes a leather jacket, makeup, black hat and doggie treats to celebrate her Heel-Face Turn.
Played For Drama: Wendy slowly succumbs to the power and seduction of the her werewolf form as part of her cries out in anguish… only to be drowned out as she gorges on the flesh of her loved ones.