Vicky is a seemingly sweet girl who has a continuous liking for cash. Once Timmy's parents are gone, she tortures Timmy so quickly that it takes one second to wreck the place, and knowing that Timmy's parents are nitwits, it's easy to fool them.
Timmy often gets revenge or revamps her, such as wishing she was nice. The parents of children and other rich people pay her wads of cash through her babysitting. Other than this, she is famous for being the cause of Timmy getting fairies in the first place, making his life extremely miserable to the point where they showed up in his lucky 9 ball. She was also the person who suffered Timmy's first wish, wishing her tub was filled with Jell-O, and making her miserable to the point of which she apologized (though only did it for her life and didn't really mean it).
She was also the person who wanted to find out Timmy's secret, until Denzel Crocker came. Otherwise, she is completely oblivious to the fact that Timmy has fairies despite that she is usually on the receiving end of their magic, even when she steals a magical object from Timmy and activates it. She has known of this secret many times, either from circumstance, and one time by Foop.
Despite being tomboyishly beautiful, Vicky is one of the most horrible babysitters around, she cheats on contests, lies to parents, and tortures children including Timmy and even her own sister Tootie. For this reason, many fans of the show consider her a sadist. Vicky is not considered to be emotional but she has shown some love during her time with Ricky, her ex-boyfriend until he broke up with her and started to date Denzel Crocker's mother whom he met on the Internet and thought she was a richer person so he could rob her just like he did to Vicky.
Also, when Vicky and Timmy were trapped after an avalanche, her anger is frozen and she showed a moment of emotion to him and even confessed rough moments in her own childhood. She usually blames all the misery she receives on Timmy. Vicky's most popular word would be 'twerp'. Her goals in life are to make lots of money, marry someone with lots of money, and possibly even world domination. Vicky is not above theft either, one time she sold a person's car off the street simply because she was offered money for it, and then attempted to steal this car again later to sell to a higher bidder.
As revealed in Abra-Catastrophe!, Vicky first started babysitting Timmy Turner when he was eight and she was fourteen. Timmy had found a flier advertising Vicky's babysitting service, and panicked and called this number when his parents tricked him into thinking he was being left alone. When Vicky arrived, she convinced Timmy's parents that they could use a babysitter so they would have time for each other to go out and do adult things. From that point on, Vicky tormented Timmy whenever she babysat him, and his parents would continue to spend time away leaving him under Vicky's cruel care. Timmy became so miserable that he needed fairy godparents. With them, he was able to use magic to get even with Vicky. Even with his fairies, Timmy is still challenged by Vicky over the course of the show. She has also worked other non-babysitting jobs, usually if they involve hurting others or holding sharp objects. In most of her early appearance, the simple act of saying her name would cause thunder and lightning to flash in the sky.
Vicky appears to have started babysitting at age fourteen or possibly earlier. When she first met Timmy when he was eight, she was just as mean as she is now. It is never explained why Vicky is the way that she is, although several conflicting plots have been put forth. In the episode Snow Bound, she reveals that she had a rough childhood. In Tiny Timmy, it is said that the her niceness never showed up to work inside her brain. In Vicky Loses Her Icky the cause of her evilness is attributed to an evil bug that crawled up her butt. In the episode The Switch Glitch, she was actually nice as a five year old, but turned bad when she wanted revenge on Timmy for being a mean babysitter. It has also been suggested in fanon that her sister Tootie being born was the cause of her disliking younger kids, and although this has never been explicitly stated, in the episode The Masked Magician Vicky lists Tootie first as she went through various enemies she had made in her life, as well as her own parents. Hanging in her house is a picture of an infant-aged Vicky is shown with the same evil scowl she has in her later life so its possible she was born this way.
Role in the series
Vicky is a poor choice for villain teams because, despite being wicked enough to try and take over her world multiple times, some villains consider her a crazy brat who only wants to see suffering and pain.