User blog comment:Trihexa/Top 10 Most Powerful Beings In The World (Unofficial)/@comment-116.88.102.6-20161003131441/@comment-9595671-20161003132927

There's actually a confirmed set of people in the Top 10 stated in the Volume 13 afterward as mentioned by B214 earlier in the comments.

They are, in no confirmed order; Ophis, Shiva, Vishnu, Brahma, Śakra, Thor, Typhon (Or Fenrir pre-nerf), Hades, Aten, and Lugh. So there's plenty of people you can put into that 10th slot.