Board Thread:Questions and Answers/@comment-24975288-20140805212217/@comment-24053170-20140805212935

We really don't all that much about Kami tenchi considering he only appears at the end of the ryo ohki ovas, and whats written in the doujinshi that that mangaka has written. what we do know is that tenchi is merely a vessel, think of it like the chousin, they created the multiverse in an attempt to find someone more powerful then themselves, my guess is Kami tenchi decided he didn't want to be bothered by those 3 so he took tenchi masaki as a vessel so they wouldn't keep looking for him, though we know how well that worked out...

We do know that his early awakening nearly shattered the multiverse and all the countless higher dimensions beyond it. the author also confirmed that yes, Kami tenchi created the chousin, but he didn't go further into detail about it. if you really want an answer you will have to ask the author himself.