Tammy is a rather tall girl for her age, her weight is normal for her height. She has blue eyes and blonde hair. She has fair skin and there's a small scar like a cut on her right cheek from her own clumsiness.

Her parents are Henry and Amanada Wilson. She has two older brothers named Christopher and Ethan. Her parents love her dearly and her father often spoils her as she is his only daughter. Christopher is more protective while Ethan is neutral with her.

Tammy is half-American and half-British. Her mother is an American but she move to England with her own family.

Tammy has a shaky relationship with Ethan as he often teases her to the point that she locks herself in her room. She's a patient girl and can handle a few teasing or mocking but he knows exactly which buttons to push.

The reason why she got the scar from her clumsiness. They were going out on a little trip to the fields and there were rocks. Tammy was running from her excitement and tripped on her own foot, her cheek had been cut by a rock when she fell. Due to that, Tammy has to be with either Christopher or Ethan when going out until she turns 17 or have proven that she can take care of herself.

Tammy is a sweet and kind girl, always thinking about the good of people and not their bad. She's clumsy and often hurts herself, she is often seen with bandages or band-aids. She's patient and loyal, defending the people she knows she can trust. She's a little timid so other people have to start a conversation with her, but she'll start one on her own if there aren't a lot of people. Social gatherings or parties are just not her cup of tea, she'd rather be alone or in the corner, invisible to others.