Board Thread:Questions and Answers/@comment-30938718-20171120163153/@comment-30671373-20180214020454

I honestly think the Overlord is the strongest. The others would be The Time Twins (when they have the blades) The Preeminent, and Nadakhan. (When he has infinite wishes)

Reasoning:

The Overlord: He is an ancient being who cannot be killed and the First Spinjitzu Master couldn't even defeat him.

Time twins: Control time, control everything.

The Preeminent: She's a freaking realm that could only be defeated when Nya unlocked her true potential.

(However, Morro will always be my favorite.)