Because you like Will McKenzie in The Inbetweeners
Draco Malfoy
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When the Sorting Hat touched Draco Malfoy's head, it placed him in Slytherin, a house that has turned out more dark wizards than any other. See them in Harry Potter Series.
Severus Snape
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Severus Snape is a misanthropic potions teacher with a vindictive streak. See them in Harry Potter Series.
Loki
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His murderous megalomania aside, Loki is quite charming. Just don't mention his strapping older brother; he's a tad jealous. See them in Marvel Cinematic Universe.