Tweek has messy blond hair and wears an incorrectly-buttoned, navy-green coat with blue pants. His eyes are a light blue and he isn’t as tall as other seniors. He is a boxer that’s why he is slim but athletic. His skin is very pale. He is 17 but almost 18. Wonder Tweek wears a dark blue shirt with a circular white 'WT' logo, which stands for 'Wonder Tweek'. He also wears light brown gloves and a dark blue headband with his name printed on it in red letters. He has control over weather.