Every rating here comes from documented feats — what a character has actually been shown to do, not where fans rank them. This one is still being worked through, so powers, brackets and rankings will move as that research continues.
If a verdict looks wrong, flag it. That is how most corrections start.
This character hasn't been fully mapped yet, so treat what's below as a work in progress rather than a finished verdict — abilities still being mapped, no weaknesses recorded, no canon victories logged. Ratings and abilities change as data is added.
Rating is a score, not a position — it rises by beating strong opponents and barely moves for beating weak ones.
Great Cthulhu as Lovecraft wrote him in 'The Call of Cthulhu' (1928): risen from R'lyeh, he kills sailors, drives men mad by sight, is burst by a rammed steam yacht — and begins to reform.