Because you like Sally Albright in When Harry Met Sally...

Gou Matsuoka offers to help as manager of a swim team, believing that they're the only ones who can help her brother. See them in Free! Iwatobi Swim Club.

Eren Jaeger will erase the Titans from this world until not a single one remains. See them in Attack on Titan.

Reclusive, quiet, and seemingly emotionless, Lain Iwakura feels like an outsider in her hyper-connected world. See them in Serial Experiments Lain.

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

Convinced that the world is conspiring against him, Tatsuhiro's reconciled himself to his fate as a shut-in. See them in Welcome to the NHK.

A crabby troll, Karkat Vantas is perpetually angry about his lot in life. See them in Homestuck.

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