Name: Soulkius (The soul's/Sol key/Kyo is us.)
Age: ?
The entity born of a successful fusion between Sol and Kyo.
When they were genin, Sol and Kyo became friends just from being on one mission together. During that time, Sol came across a scoll of an ancient technique called fusion. The technique needed two beings to have perfect harmony with one another in both spirit, mind, and strength. The beings existence's would merge into one temporarily, creating a new being that was more than 5 times stronger.
They didn't successfully perform the technique until they both were chunin, and even then, they could only sustain the transformation for 5 minutes due to the chakra usage.
Today, Soulkius can exist for days at a time. His strength goes beyond measurable amounts, and has not been given a title yet.