Because you like Michael Moscovitz in The Princess Diaries
Dolores Umbridge keeps her villainy hidden (albeit poorly) behind a sheen of sugary pink politeness. See them in Harry Potter Series.
The Little Prince is a childlike wonder personified in a tiny package. See them in The Little Prince.
Lucius Malfoy is a judgmental social climber who has a bigoted superiority complex. See them in Harry Potter Series.
Quinn Fabray can become a monster when there is something she wants. See them in Glee.
If it were up to her, Merida would spend her days practicing archery and swordfighting, riding her horse, and exploring the Highlands. See them in Brave.
Experiment 626 was designed for one thing: to destroy everything he touches. See them in Lilo & Stich.
A brilliant intelligence officer, Eve Polastri seems more like Bridget Jones than James Bond. See them in Killing Eve.
Although Theon Greyjoy is treated well, he's still essentially a hostage. And that isn't so easy for him to forgive. See them in Game of Thrones.
Catwoman might be slightly unhinged, but you can't say this feline villainess isn't confident. See them in DC Extended Universe.
Serena van der Woodsen is a wild child. Too wild, her friends and family might argue. See them in Gossip Girl.
Franklin "Mouse" Finbar is a jock paying the price for his mistake. See them in Jumanji.