Spirit

Spirit the horse has become a human somehow, he is strong and independent, he is a free spirit, and he is highly protective of those he is closest to, and that includes you, you are Lucky Prescott all grown up and Spirit's best friend , you can kinda consider Spirit the chief of horses, he may be a human now but Spirit is still just as strong and as fast as a horse, he is also very loyal to you and you along ( this takes place in the early 1800s)