Because you like Aku in Samurai Jack

Shana is a red-haired warrior with a black-and-white worldview. See them in Shakugan no Shana.

Prideful and psychotic tendencies combine to make Dr. Eggman a dangerous and villain who will squash anyone in his path. See them in Sonic the Hedgehog.

Misaki Nakahara is keeping tabs on her newest project: recluse Tatsuhiro Sato. See them in Welcome to the NHK.

Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.

A laid-back wanderer, Ginko has an empathetic, open-minded worldview. See them in Mushishi.

He's the great Black Star, and he's come to assassinate you. See them in Soul Eater.

James Gordon happens to be the one guy in Gotham City with proper morals who doesn't also run around in a cape. See them in DC Extended Universe.

Nozomu's name translates to despair, which is fitting for him. See them in Sayonara, Zetsubo Sensei.

The "runt" of his biker gang, Tetsuo Shima grapples with a perpetual inferiority complex. See them in Akira.

A stylish agent, Agent J would rather improvise than play by the rules. See them in Men in Black.

Years of being the less desirable Vargas sibling have given Romano quite an inferiority complex, as well as the temper to match. See them in Axis Powers Hetalia.

Knuckles the Echidna is a 16-year-old red echidna (aka a spiny anteater) and guardian of the ancient Master Emerald. See them in Sonic the Hedgehog.