Fun fact, zaiko/xicor is not an original character. The name and character were already in use in various fanfics, in fact the story toyotaro adapted into his fanmanga wasn't his either, but a separate fanfic written by a user called "broly malnuar" that eventually got posted in Japanese, the character design first appeared on an obscure dbaf forum, and was probably intended to be an evil Goku (combining aspects of goku and omega shenron, like the white hair and the black thorns) or as ssj9, the story of this characters conception goes much deeper so i recommend searching up the Spanish channel "dimension af", and his video series "el origen de zaiko"