Mudbriar

Mudbriar is a male Earth pony and Maud Pie's boyfriend who appears in the season eight episode The Maud Couple.

Development and design
Mudbriar shares his body type and eye color with Cheese Sandwich and his body type with "Turner McColt", "Mules Grassfield", Dandy Grandeur, and S08E04 Unnamed Earth Stallion #1.

Depiction in the series
In The Maud Couple, Mudbriar first appears in a bakery supply shop when Pinkie Pie unintentionally cuts in front of him in line. To Pinkie's annoyance, he takes a long time to finish his business with the shopkeeper, trying to decide between saying "Goodbye" or "See you later" and giving a long-winded explanation of how the two sayings are different. By the time he finishes his business, the shopkeeper has left for lunch, leaving Pinkie unable to buy anything.

Outside the shop, Pinkie's sister Maud introduces Mudbriar as her new boyfriend, the two having met during an exhibit on petrified wood and finding they had a lot in common. Mudbriar's strange quirks and behavior irritate Pinkie, and she wonders what Maud sees in him. At Starlight Glimmer's encouragement, Pinkie works together with Mudbriar to plan Maud's upcoming birthday party and get to know him better. However, he continues to annoy Pinkie with his mannerisms, and Pinkie takes offense to the implication that he knows Maud better than she does.

Pinkie's distress over the strain that Mudbriar's presence places on her relationship with Maud drives her to run away to her family's rock farm. Her other sisters Limestone and Marble tell her that despite how frustrated Mudbriar makes her, how happy he makes Maud is most important. Pinkie returns to Ponyville to make amends with Mudbriar, and they make their shared vision of Maud's perfect birthday party a reality.

In The Break Up Break Down, Mudbriar appears spending time with Maud during Hearts and Hooves Day.

Personality
Similar to Maud, Mudbriar is portrayed as very stoic and occasionally literal. He has a tendency of pointing out technicalities, and he has a great interest in and knowledge of sticks—calling any mistreatment of sticks "stick abuse". He also appears to have a well-developed memory, able to recall details of things from what he calls his "mind palace". Also like Maud, Mudbriar has an inanimate object for a pet: a stick named Twiggy.

Mudbriar is shown to be very close with Maud, making her interests his interests, having an entire "room" of his "mind palace" dedicated to things she likes, and at the end of his debut, he is happy to be friends with Pinkie Pie through their shared interest of making Maud happy.

Quotes
"Technically..."

- Repeated line, The Maud Couple

"I will not apologize for speaking with precision."

- The Maud Couple

"Due to the speleothems growing from the ceiling, this is more of a cavern than a cave. Maud taught me that."

- The Maud Couple

"It sounds like she was protecting your feelings. She's very caring that way."

- The Maud Couple

"This isn't even an olive branch. It's a quercus, most likely castaneifolia. [...] And I love a good quercus. Friends?"

- The Maud Couple