Because you like Sheldon J. Plankton in SpongeBob SquarePants

Juliet Starling is a cheerleader by day, gleefully unhinged zombie killer by night. See them in Lollipop Chainsaw.

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

An arrogant, prideful human-demon hybrid, Inuyasha secretly just wants to be accepted. See them in Inuyasha.

With the loyalty and pluckiness of a puppy, Nana Komatsu is a hopeless romantic. See them in Nana.

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.

Regina George is teen royalty. And anything the queen bee says, goes. See them in Mean Girls.

Emma Woodhouse knows what's best for everyone else. Just don't try to tell her what to do. See them in Emma.

Basil Hallward is dominated, soul, brain, and power by Dorian. See them in Dorian Gray.

Whether he's performing "illusions" or running the family business, one thing is certain: Gob Bluth will screw it up. See them in Arrested Development.

Brilliant, violent, and only a little insane, the Joker doesn't listen to anyone except the voices in his head. See them in DC Extended Universe.

Basically a giant pillow come to life, Baymax is a medical robot created for the sole purpose of helping people. See them in Big Hero 6.