Niche

Nie is an innocent and sweet boy. He cares for others and is very naive. He's a bit more timid than his other personality, but has no knowledge of Che or Sairune.

Che is the strong personality. He likes to play tough and talk big, but he's not actually that big or strong. He normally keeps the golden eye closed and is often referred to as the more demonic personality.

Both the above personalities respond to the name Niche, and will introduce themself this way. However, if someone is able to tell the difference between the two personalities, they can make Che impressed.

Sairune is unknown by the other two personalities. That's because they are both a part of him and he split himself because he doesn't want to exist in the world anymore. When he is drawn out, he is a powerful demon. Unlike the split personalities, who look about 15, he looks to be in his 20s. His body goes through physical changes when he comes out. He gets taller, both eyes are golden yellow, he has paws instead of feet, and he gives off the vibe of a killer.

Nie and Che can't read, but Sairune can. Nie and Che don't have any special demonic powers, but Sai does [this is because the two personalities is a seal on himself]

Niche had been captured when he fell into another world and was abused for over a week before he was rescued by a nice guy. However, this nice guy, despite taking care of the wolf, betrayed him in the end. He threw Niche overboard from a ship, where the canine almost died because Niche and Sairune can't swim. 

If he is ever RPed again, the starting point can either be from him in the water of this world, or him coming to in his own world and exploring or whatever. (He can wash ashore, or someone could see him "fall" into the water, or a number of things)