Because you like Dobby in Harry Potter Series

Walter White's knowledge of chemistry allows him to cook astoundingly pure meth, leading to a rapid – albeit tumultuous – rise in the criminal drug world. See them in Breaking Bad.

Jane Smith is a stone-cold killer, but you would never know it from looking at her. See them in Mr. & Mrs. Smith.

You wouldn't know it by looking at her, but beneath Sheila Jackson's sweet, motherly exterior lies a sex addict. See them in Shameless.

Pro tip: the psych ward is not the best place to find a mentor like Lisa Rowe. See them in Girl, Interrupted.

Tiffany Maxwell wishes people would stop reminding her about her dead husband. See them in Silver Linings Playbook.

A formerly timid caterpillar, Kurt Hummel is transforming into a glamorous, confident butterfly. See them in Glee.

Ellie is more world-weary than most 14-year-olds. You would be too if your world was infested with zombies. See them in The Last of Us.

Eleanor puts up a tough front, even when everyone else tries to tear her down. See them in Eleanor and Park .

Combining an innocent face with an insatiable bloodlust, Eli recruits friends to join the vampire way of life. See them in Let the Right One In.

Rukia Kuchiki is a cool and collected warrior who has trouble opening up to anyone. See them in Bleach.

Whether it's a companion he’s failed or lingering guilt from the war, the Doctor can never truly let go of his past lives. See them in Doctor Who.

Clank is the quintessential rational, intelligent robot sidekick. See them in Ratchet & Clank.