Because you like Manuel Calavera in Grim Fandango

Optimus Prime is a shapeshifting sentient robot leading a team of robots to stop evil from taking over. See them in Transformers.

The Little Prince is a childlike wonder personified in a tiny package. See them in The Little Prince.

Edward Elric has a quick mind along with a quick temper. See them in Fullmetal Alchemist.

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.

Even the smallest person can change the course of the world, if he's brave enough. See them in The Lord of the Rings.

A crooked cop, Harvey Bullock is the product of a not-so-just criminal justice system. See them in Gotham.

Reckless, vulgar, loud-mouthed: that's what makes Amethyst so awesome. See them in Steven Universe.

Homer Simpson is a beer-loving disaster in charge of nuclear safety in Springfield. Everybody run! See them in The Simpsons.

Charles Xavier is a telepath who believes mutants and humans are both good at heart and can live in harmony. See them in X-Men Series.

An intriguing bundle of contradictions, Sawyer Ford trusts no one on the island, and no one should trust him. See them in Lost.

A compassionate medical student, Martha Jones has found a Doctor she can really look up to. See them in Doctor Who.

Sometimes being a supportive girlfriend like Ophelia doesn't work out too well. See them in Hamlet.