Basic Trope: A character's personality is at odds with their wild appearance.
Straight: Sherry looks like a wild biker chick, what with her love for black leather, hip-hugging shorts/skirts, long mane of hair, and so on. Despite her appearance, however, she's actually quite calm and friendly.
People take one look and give Sherry a wide berth, since she looks like an absolute hellion who'd gleefully kill anyone who looked at her sideways. Truthfully, however, she's actually a painfully shyFragile Flower.
Sherry is always completely nude and doesn't care who sees her thus, covered from head to toe in bright red-and-blue tattoos, and puts her own blood in her hair. She's also incredibly civic-minded and needs no invitation to pick up trash/plant trees/read to small children/what have you. For free.
Downplayed: Sherry merely wears black but fairly normal clothes and is cheerful.
Sherry is incredibly shy, so she puts on a deliberately scary appearance so she will be left alone.
Sherry is naturally shy but wants to be more outgoing, so dresses the part in an attempt to become more expressive.
Sherry dresses the way she does because she thinks it looks cool.
Inverted: Sherry's wardrobe is nondescript, but her fashion choice belies a wild, downright dangerous personality.
Subverted: Sherry wears crazy clothes and pretends to be nice. But she's really nutty.
Double Subverted: ...However, this is revealed to be a massive act Sherry puts on.
Parodied: Sherry's outfit of choice is a prison jumpsuit. She's an Evangelical minister.
Zig Zagged: Sherry wears black, heavy makeup, and spikes, but she's quiet and rarely talks. But it turns out that you caught her when she had the flu. Usually, she's cranky, loud, and obnoxious. Except it's all an act...or is it? Also, her choice in clothes varies. When she's around her family, she's ridiculously conservative. When she's with her friends, she's back to her old goth/punk fashion.
Averted: A person's clothes can empower you to make a well-educated guess regarding their personality.
Enforced: Sherry was introduced to teach viewers An Aesop about not judging a book by its cover.
Lampshaded: "Seriously? There is no way that she is as wild as she looks. Probably really just a bookworm or something."
Invoked: Sherry deliberately dresses wildly in order to repel others, not wanting to deal with people who would shallowly judge her based on her appearance.
Exploited: Sherry uses her wild way of dressing to intimidate people who mistreat her friends and family.
Defied: Sherry dresses in a muted way to suit her calm and friendly personality.
Discussed: "In this Bizarro World, I'd bet absolutely anything she's really a good person underneath that sneer and tight black leather and nylon."
Deconstructed: People's judgmentalism about Sherry's clothes cause her to forget who she really is so she can live up to their expectations...
Reconstructed: ...but she realizes what's happening to her and figures she can have whatever personality she wants to regardless of what people think.