Prince Rutherford

Prince Rutherford is a male yak and the prince of the kingdom of Yakyakistan. He appears as a supporting character in the season five episode Party Pooped.

Depiction in the series
Prince Rutherford appears in Party Pooped as part of a Yakyakistani delegation to Equestria. When he first meets Princess Twilight Sparkle, he expresses a desire to foster a good friendship between ponies and yaks. However, over the course of their visit to Ponyville, Rutherford and his entourage trample and destroy everything with which they take even the slightest issue.

Twilight serves Rutherford a banquet of traditional yak foods, but Rutherford destroys the banquet table because he doesn't like how the food tastes. Applejack makes him and his fellow yaks Yakyakistan-style hay beds, but Rutherford destroys them because they aren't made from Yakyakistan hay.

The yak prince reacts similarly to Fluttershy's animal friends, Rarity's fabrics at Carousel Boutique, Rainbow Dash's snow, Mrs. Cake's baking, and Spike's piano playing. Eventually, Prince Rutherford becomes so frustrated that he decides to leave Ponyville and declare war on Equestria.

Thanks to Pinkie Pie—who travels across Equestria in an attempt to help the delegation—a friendship party in Ponyville boosts Rutherford and the yaks' spirits. When Pinkie approaches Rutherford and talks at length about what makes Equestria great, Rutherford calls off his declaration of war and becomes good friends with the ponies.

Personality
Prince Rutherford is portrayed as loud and incredibly short-tempered. He is usually gracious enough to meet with Princess Twilight and her friends on calm footing, but he becomes volatile if something displeases him, typically flying into a destructive rampage. He is, however, cultured enough to appreciate classical music.

Rutherford speaks in broken sentences, omitting most grammatical articles from his speech and sometimes referring to himself and his entourage in the third person.

Quotes
"Me honored. Yaks hope for great friendship between ponies and yaks. [echoing] Friends for a thousand moons!"

- Party Pooped

"If things not perfect, yaks get mad. Yaks always get mad when things not perfect!"

- Party Pooped

"Not perfect! Yaks destroy!"

- Party Pooped

"Music beautiful. Much soul."

- Party Pooped

"We leave now! Yak go to train, return with more yaks! We declare war!"

- Party Pooped

"Pink pony work hard to make yaks feel at home. Now yaks happy. No declare war."

- Party Pooped

"Pink pony, you understand yaks now."

- Party Pooped