Winston is a boy at Vicky's high school that she has a crush on. She keeps his hair and gum in her diary, and attempts to become a cheerleader just to impress him. Despite doing seemingly everything she needed to win him over, he still rejected her because she did not manage to become a cheerleader.
Winston is fashioned after the most offensive stereotype for a British person possible: A snobby, nerdy boy with a posh accent, bad teeth, and a penchant for tea and "the hunt". Despite his geeky appearance, he is very popular among the ladies.
He enjoys flirting, drinking tea, and referring to "the hunt". He is very shallow and only dates girls who strictly conform to his likes. His fascination and love for the hunt gives him many likes. He is terrified of the color pink, as well as squirrels.
His appearance was in A Bad Case Of Diary-Uh!. When Timmy read Vicky's diary, he found that she had a secret crush on Winston Dunsworth, a British boy at Dimmsdale High School. Winston did not return the affection, so Vicky was trying various ways to win him over. Timmy attempted to sabotage Vicky's advances, but every time he did something intended to gross Winston out, he liked it (because what they did reminded him of the hunt). To win him over, Vicky rehearsed at cheerleader tryouts, but because of Wanda and Timmy's interference, she blurted out her horrible secrets in her cheers, causing Dunsworth to become offended. Vicky broke down and started crying.
Elsewhere, Timmy's parents hired Evil Babysitters that were even worse than Vicky when she didn't show up for work, so Timmy set out to make her happy again by having her rescue Winston from his worst fear: pink squirrels. Timmy returned to Vicky the next day, still at her high school crying in the same spot she had been before, and accidentally revealed that he had been peeking in Vicky's diary when he told her the "fat pink squirrel she hated" (Wanda) was attacking Dunsworth. Vicky used a truth serum to get Timmy to confess he had been reading her diary, and then used Timmy to beat away Wanda, leaving them both stuck in the ground head first. Vicky then left hand and hand with Winston, and it appeared they were together, when he suddenly dumped her because she wasn't a cheerleader, and then he flew away with an umbrella. Vicky cried again, but went back to babysitting Timmy. Dunsworth was never seen or mentioned in any other episode.