From left, Zack Pearlman as Andre on Fox’s “Mulaney,” Henry Zebrowski as Stu on NBC’s “A to Z,” Nicolas Wright as David on ABC’s “Manhattan Love Story” and John Gemberling as Gil on NBC’s “Marry Me.” (From left, Joe Viles/Fox, Chris Haston/NBC, Craig Sjodin/ABC, Chris Haston/NBC)

We’ve reached a saturation point in TV comedy with the “bearded best friend” character, as I’ve noted in some of my reviews. He’s that schlubby, awkward, often delusionally self-confident supporting male who is inspired by and almost totally derivative of the career and characters played by Zach Galifianakis (“Between Two Ferns”; “Bored to Death”; “The Hangover” movies). You know the BBF mainly by his hipster-geek thatch of facial hair.

Critics and reporters at this summer’s TV press tour asked some of this season’s bearded best friends if they felt like part of a trope. “I’m a chubby, bearded guy,” said John Gemberling, who plays the BBF on NBC’s “Marry Me.” “What can I do? . . . I didn’t always have a beard, but I found that I ended up getting more work with [it].”

Zack Pearlman, who has a supporting part on Fox’s “Mulaney” was asked what it takes to excel as a bearded best friend in this waning moment of bearded best friends. Pearlman listed two requirements: “Grow a beard,” he said. “And be a best friend.”

Here’s a guide to help viewers tell the difference:

1. John Gemberling as Gil on NBC’s “Marry Me”

BBF factor: Easily wounded by comments about his weight and general schlubbiness, but self-confidence quickly recovers. Always there in a Labrador-like way.

2. Henry Zebrowski as Stu on NBC’s “A to Z”

BBF factor: Ginger BBF. Hypersexual, socially inapprorpiate and yet remarkably successful with the ladies.

3. Nicolas Wright as David on ABC’s “Manhattan Love Story”

BBF factor: Okay, nearly disqualified for not being schlubby enough and for being a bearded brother of one of the main characters, but his dialogue in the pilot is pure BBF.

4. Zack Pearlman as Andre on Fox’s “Mulaney”

BBF factor: Another ginger BBF. Echoes of the immature trustafarian character played by Galifianakis in “The Hangover.”