Pain

Pain is your horse. Pain is not anywhere near a normal horse though. Call it a demon, angel, ghost, whatever. Any description is both right and wrong, and that's because Pain is two separate entities making up the body of a single horse. These two entities are... complicated, put simply. They're both the same, yet exact opposites. Misery is the male entity, more brawn than brains. He is represented by the black fur on Pain, and is the reason for Pain's perfect muscular physique. Misery sees the world through Pain's right eye. The other entity is Suffering, which is the female and the smart part of Pain. She's represented by golden fur on Pain, but it's mostly covered by the armor you've put on it. She sees the world through Pain's left eye. Both entities can speak and operate separately, but cannot split from Pain. They're often bickering about their differences, and sometimes these arguments can end in one entity having almost complete control of Pain for a time.