Because you like Boromir in The Lord of the Rings
Buttercup is a farm girl turned princess who'd do anything to have her old life back. See them in The Princess Bride.
Django was once a slave. Now that he has a taste of freedom, he understandably wants a full meal. See them in Django Unchained.
Altair Ibn-La'Ahad is as much a philosopher and detective as he is a killer. He takes nothing at face value and continually searches for deeper truths. See them in Assassin's Creed Series.
The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.
Romantic, tortured, and at times cruel, Heathcliff is an intense man. See them in Wuthering Heights.
An infamous vampire, Alucard is a one-man killing machine with a philosophical side. See them in Hellsing.
Catherine Linton was once spontaneous and rowdy but ever since marrying the wealthy Edgar, she has morphed into a boiling pot of emotional outbursts. See them in Wuthering Heights.
Driven yet empathetic, Emily Prentiss brings humanity to the pursuit of inhuman killers. See them in Criminal Minds.
Rick Sanchez is a gruff, alcoholic mad scientist, with the emphasis on "mad." See them in Rick and Morty.
Everything is fascinating to Octavia Blake who has been locked away for her entire life. See them in The 100.
Mystique is a shape-shifting mutant who, after too many disappointments, does not want to co-exist with humans. See them in X-Men Series.