Because you like Effie Trinket in The Hunger Games
Give in to the dark side with vampire Lestat; it's more fun. See them in Interview with the Vampire: The Vampire Chronicles.
Mitchell Pritchett prefers to have a place for everything and everything in its place. See them in Modern Family.
A ball of cheerful energy, Pinkie Pie is as sweet as her name suggests and lives to bring others joy with laughter and parties. See them in My Little Pony.
Dutiful, composed, and aloof, Sun Bak is the fighting force behind her team of eight "sensates" who are telepathically linked. See them in Sense8.
Amy March blends her naturally artistic spirit with a sense of practicality. See them in Little Women.
Harrison Wells is a brilliant scientist full of secrets. See them in DC Extended Universe.
Strong-willed Norah Silverberg isn't willing to be the goody bag at anyone's pity party. See them in Nick and Norah's Infinite Playlist.
Marie Antoinette may be a fun-loving queen who has it all, but her husband doesn't know how to have sex, and an angry mob wants to cut off her head. See them in Marie Antoinette.
Anywhere there's adventure, Jaskier is there to write a catchy song about it. See them in The Witcher.