I do not own rwby and dragon ball. I am going to tell you a little bit about your past. Y/N was a human born on earth suddenly he felt that that his power begin to rise. He loves watching animes. His favourite anime was dragon ball super. He also noticed that he have a tail. He realises that he is not a human anymore. He googled about animes in which people have tails. He already knew that a saiyan has a tail but he got to know that a fanus also has a tail if it is a monkey fanus. This is for now I will let you know about your past in later chapters.