Minimus

Minimus is a winged horse who lives in the stables of Royal Prep. When Sofia decides to try out for the Derby Team, Minimus is the last horse left. He is surprised to find Sofia can understand him, courtesy of the Amulet of Avalor, though he tries to discourage Sofia from choosing him since he's smaller and slower than the other winged horses, but Sofia tells him he's perfect the way he is.

With James coaching, Sofia and Minimus train together for the Try-Out Race but no matter how hard he tries, Minimus can't fly up through the steeple that is the last obstacle for the race.

But when the race finally comes, with Sofia's resolve and encouragement, Minimus finally makes it through the steeple, and together they win the race, earning them a spot on the Team.