Because you like Bernadette Rostenkowski in The Big Bang Theory

Poison Ivy is a seductive, venomous botanist laments the fact that there are so many people to kill, yet so little time. See them in DC Extended Universe.

Marty McFly is a skateboarder, aspiring rock star, and reluctant time-traveler. See them in Back to the Future.

Ratchet is a shoot-first, ask-questions-later, and then-shoot-again kind of lombax. See them in Ratchet & Clank.

Charming and confident, Gus Waters is determined to leave a lasting mark on the world. See them in The Fault in Our Stars.

His name is Olaf, he's a snowman, and he likes warm hugs. See them in Frozen.

Spike is punk meets vampire meets romantic poet. See them in Buffy the Vampire Slayer.

Liv Moore is a sarcastic high-achiever turned morally conflicted zombie. See them in iZombie.

Accessing more than 10 percent of your brain can do strange things to anyone, and Lucy is Exhibit A. See them in Lucy.

Rarity has been dreaming of the day her designs will dazzle Canterlot. See them in My Little Pony.

Phoebe Caulfield is a wise-beyond-her-years 10-year-old with an empathetic spirit. See them in The Catcher in the Rye.

Just call Jeff Lebowski The Dude. Or His Dudeness, Duder, or El Duderino if you're not into that whole brevity thing. See them in The Big Lebowski.

All who live know his name, and all who oppose him shall know Death. See them in Darksiders Series.