Because you like Cookie Monster in Sesame Street
Andy Bernard is a preppy Cornell grad who's very likely to break into an acapella performance. See them in The Office.
Greg Heffley will be famous someday, but now he's stuck in class with morons. See them in Diary of a Wimpy Kid.
Waylon Smithers would do anything for his boss, and would love to do a few things *to* him. See them in The Simpsons.
Anger is a cantankerous hothead whose job is to get others riled up. See them in Inside Out.
Dewey Finn will rock you. He feels rock and roll in his blood and guts. See them in School of Rock.
Linda Belcher doesn't prescribe to what society deems as "normal." She narrates her life through song, much to the alarm of everyone nearby. See them in Bob's Burgers.
The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.
Disgust is a friend who makes sure you stay away from all things gross. See them in Inside Out.
Mother Gothel is a great mother as long as you never, ever, break the rules. See them in Tangled.
Moe Szyslak is the crabby owner of the grimiest bar in Springfield. See them in The Simpsons.
Buddy Pine is an unhinged superfan of superheroes using technology to take down his idols. See them in The Incredibles.