16. Professor Whitman (John Michael Higgins)

A parody of Robin Williams in Dead Poets Society, Professor Whitman is there mostly to annoy Jeff, who has no interest in seizing the day. The character doesn’t get to do much, but comedy vet John Michael Higgins brings just the right kind of desk-jumping verve.

15. Senor Chang (Ken Jeong)

I'm going to get hell for this, but Senor Chang's manic, grating character is the only main character the show just can't seem to get right. He's meant to be pathetic and off-putting, sure, but he needs to be those thing and also funny. There is something about the way Ken Jeong portrays Chang that is just one step too far out of the show's reality. (And this is a show that's already about four steps out.) I will say this, though: Chang is funny when he's breaking things, like when he's beating up a car with a keytar, breaking a lamp with nunchucks, or flipping over tables in the cafeteria.

14. Star-Burns (Dino Stamatopoulos)

While Star-Burns’ increasing attempts to stand out — adding a top hat to his ridiculous facial hair, etc. — are a nice background joke, they're not really laugh-out-loud funny. But the character does yeoman's work in smaller scenes. He lands this high on the list for one particularly glorious moment: when, as he slowly deteriorates from a horrifying zombie virus, he plaintively shouts out, “My name is Alex!” And no one cares.

13. Fat Neil (Charley Koontz)

Fat Neil is responsible for "Advanced Dungeons and Dragons," a truly hysterical episode of Community (though, in the show itself, he’s not so much funny as sad.) In previous episodes, he’s mostly used as a punching bag and a reaction-shot machine, but he places so high because his reaction shots are some of the best — pitiable, full of sadness, and still hilarious.

12. Garrett (Erik Charles Nielsen)

Garrett's sputtering, somehow-both-flat-and-excited manner could get annoying quickly, but the show knows to use him in small doses. His natural discomposure makes his big moments spot-on (like when he warns Jeff about the paintball game that's taken a turn for the serious), and his small moments wonderfully weird (like when he turns a three-word weather report for “Troy & Abed in the Morning” into a punchline).

11. Rich (Greg Cromer)

Also known as Doc Potterywood, Rich is the seemingly perfect guy who drives Jeff insane, and his unflinching earnestness is the perfect counterpoint to the group's moral failings. His good-boy routine is fun, but I like him best when he's dooming the group to death by zombie. (“I thought I was speeeeciaaaaal...”)

10. Vaughn (Eric Christian Olsen)   

"Hi. What's up?" "Hey, Vaughn." The perfect send-up of every pseudo-hippie, hacky-sack playing dude you ever met at college, Vaughn is the Rich before Rich — a polar opposite of Jeff, moving in on one of his ladies. He rambles about antioxidants. He says “lates” for “later.” He never wears a shirt. But best of all, he sings the classic Community songs "Getting Rid of Britta," and one I can only assume is called "Pierce You're a B."

9. Professor Ian Duncan (John Oliver)

What kind of psychologist do you have to be to end up at Greendale? A terrible, self-serving, alcoholic one, of course. Professor Duncan's open disregard for his job, the school, and many of its students — combined with, not going to lie, his British accent — make his appearances as caustic as they are welcome. His stand-out moment, though, is probably his terrible drunken rap at the Transfer Dance. You know what, I'll just go ahead and quote it: "My name's Ian Duncan and I'm here to say / I'm going to rap to the beat in a rapping way / I've got a real big penis and I drink lots of tea."