Zephyr Breeze

Zephyr Breeze is a male Pegasus pony and Fluttershy's younger brother who appears in the season six episode Flutter Brutter.

Development
Fluttershy's brother was initially revealed by Andrea Libman at the 2015 San Diego Comic-Con International.

In mid-March 2016, Jim Miller tweeted, "Spent the morning working on an #mlp6 episode with anew character I love to hate. Or is it hate to love?", and specified said character to be a "NEW character". On June 4, 2016—the day of Flutter Brutter's premiere—Miller tweeted, "15 minutes till you meet the character I love to hate! #MLPSeason6", and specified said character to be Zephyr Breeze.

Depiction in the series
Zephyr Breeze appears in the season six episode Flutter Brutter, introduced as Fluttershy's younger brother. He is depicted as a chronic slacker who freeloads off of his parents after dropping out of mane therapy school.

When first introduced, Zephyr is stated to have pursued various interests before quickly giving up on them, including mane therapy and sculpting. Unable to support himself, he frequently moves in and out of his parents' home in Cloudsdale, much to the frustration of his older sister. He is also heavily infatuated with Rainbow Dash, constantly flirting with her under the narcissistic belief that she is obsessed with him.

When Zephyr moves back in with his parents, his presence serves as a nuisance and burden to their way of life. He moves their knickknacks out of the way to make room for his own, and he re-purposes his father's cloud collection storage house as his art studio/meditation garden. When Fluttershy confronts him about this, her parents take her side, and Zephyr tearfully takes his leave—only to move in with Fluttershy soon afterward.

Though his presence in her cottage is just as cumbersome as before, Fluttershy allows Zephyr to stay on the condition that he get a job. However, his attempts at being employed usually involve him slacking off and getting others to do the work for him or otherwise quitting without even trying. As a result, Fluttershy kicks him out of her cottage, and he goes to live by himself in the Everfree Forest.

Incapable of living on his own, Zephyr eventually confesses to his sister that his unwillingness to try stems from a crippling fear of failure. Fluttershy convinces him that sometimes one has to do things, even if one might fail. With the support of Fluttershy and Rainbow Dash, Zephyr pursues mane therapy once again and graduates from mane therapy school.

In season eight, Zephyr Breeze makes a brief cameo appearance in Las Pegasus in Grannies Gone Wild.

Depiction in Equestria Girls
Zephyr's human counterpart appears in the My Little Pony Equestria Girls: Better Together short Overpowered, asking Rainbow Dash out on a date before being snubbed. In the "Choose Rainbow Dash" ending of Best Trends Forever, he appears following the Rainbow Dash-inspired fashion trend. Zephyr also makes a brief cameo in part 3 of My Little Pony Equestria Girls: Forgotten Friendship, hanging out with Snips and Snails outside Canterlot High School. In the beach-themed short Blue Crushed, Zephyr tries to impress Rainbow Dash with his surfing skills and fails miserably.

IDW comics
Zephyr Breeze appears with his family on page 24 of the My Little Pony Holiday Special 2017 comic.

My Little Pony (mobile game)
Zephyr Breeze is a character in Gameloft's mobile game. The game's description of him states, "Though formerly lazy, this pony’s no slouch... But is there a chance he could crash on your couch?"

The Elements of Harmony Vol. II guidebook
''THE SHY FAMILY lives in Cloudsdale. It's where MRS. SHY spends her time gardening and MR. SHY collects clouds since retiring from the weather factory. The heroism of their daughter, FLUTTERSHY, makes them burst with pride! Their son, ZEPHYR BREEZE, dropped out of mane therapy school. He never leaves the house. Mr. and Mrs. Shy wish he'd get a job and his own place.''

Quotes
"Guess who's home! That's right, big sis, it's your one and only favorite little brother, moi."

- Flutter Brutter

"Sorry, sis, but when something's not the right fit, this pony's gotta fly!"

- Flutter Brutter

"I hate to deprive you of my presence, but this breeze needs his Z's."

- Flutter Brutter

"Cracking the whip, huh? You always were kind of bossy."

- Flutter Brutter

"Turns out the animal communication thing isn't genetic."

- Flutter Brutter

"You don't have to come up with some excuse to hang out with me, Rainbows! Let's just go for a fly and see where the day takes us."

- Flutter Brutter

"What if I give everything I have and still fail? Honestly, I think it's better not to try at all."

- Flutter Brutter

"It was only a matter of time before they recognized my true genius! But actually doing the work probably helped."

- Flutter Brutter

"Just because I've never held a job longer than one day doesn't make me a quitter... It makes me a sampler! I'm building up a portfolio! To be perfectly honest, it's quite a lot of work, and I wish more ponies understood how hard it is..."

- Enterplay collectible card game Defenders of Equestria expansion set card #56 SR of Zephyr Breeze

"My parents are the best friends I could ask for!! Mom gives me all the space I need!!"

- My Little Pony Facebook post