Epona

Epona is a horse from the Zelda Universe that resides in Lon Lon Ranch.

She's first seen in Ocarina of Time being sung to by her owner, Malon, as a foal, but she's easily frightened by strangers. When Link played her song, she soon grew fond of him, and their bond had been close ever since. Her bond was tested after seven years, when Link was able to ride her as Ingo was running the ranch. The selfish, abusive owner wanted to sell Epona to the great Ganondorf, but Link challenged him in two races. After Ingo lost, he trapped both Link and Epona in the ranch, until they escaped as she leapt over one of the back fences. Since then, she became Link's own method of transport, and also helped him to shoot down the elusive Poes.

In Majora's Mask, she was Link's own pony as he headed out to search for Navi. Unfortunately, she was taken away by the Skull Kid, as she kept running in fright into the unknown. He eventually found her in Romani's Ranch in Termina, and he was able to use her as transport again.

She was also Link's main mare in Twilight Princess as well.

Ikran's Lost OoT/Pokémon crossover
Epona was portrayed like in the game, though Zelda II prefers to race alongside her using her Rapidash. She was befriended with her Ponyta, until her sudden fate seven years later.