>>5They last for 1,000 years before their bodies can no longer hold any more power. The book gives them the power to survive for 1,000 years, and then the power of the books forces them to fight each other to kill everyone of them off else the power builds up and can do shit like breaking Pangaea apart into the continents we have today.
Also when the big bang happened, it sent powers into all planets, these powers eventually seeped into rocks, turning into crystals, and those crystals were placed inside of 10 journals many, many, many years ago. The crystal's power allowed anything written or drawn to become reality. Eventually people learned of it, and used it so much that the crystals gained a bit of self awareness enough to create 10 other books in their places, and those 10 clones would find people befitting to the individual book's recorded personalities based on who had used the book.
What I mean is who uses the 10 books, each book records a list of personalities, and then chooses a dominant one, in which if that personality is spotted in someone, they are in line every 1,000 years.