User blog comment:BangJang96/Bang's personal opinion on the strongest character in fiction./@comment-28072188-20170714202732

The Writer isn't the only True Omnipotent in fiction, there's also

Pre-Retcon The One Above All

Azathoth from Lovecraft

The Law of Identity from Ichiban Ushiro no Daimao

Kami Tenchi from Tenchi Muyo

Azathoth from Demonbane (different Azathoth)

The Creator from Umineko

Undoubtedly First from Cryptozoi

Divine Presence from I/O

These are all the characters listed as Tier 0 on VSB (yeah might not be the most reliable site but best I'm aware of)

As such these verses should all be tied for strongest