Talk:Great Demon Lord/@comment-36209226-20190219143339/@comment-10330822-20190220011742

Unlikely, it was probably the opposite. Rimuru made his subordinate True Demon Lords via Beelzebub. In truth, what probably happened is a combination of him evolving into an Ultimate Slime and having True Demon Lord subordinates. Hence why he didn't evolve into a Great Demon Lord until after he became an Ultimate Slime, which was long after he started he started making True Demon Lords. Remember Ultimate Slimes are on the same level as True Dragons, and the Great Demon Lord is up there in that SS-Class as well. That's probably also why monsters evolve into similar S-Class evolutions when they become True Demon Lords, for the opposite reason.

For example, Rimuru evolved into an S-Class Demon Slime because he became a S-Class True Demon Lord, and Diablo and the other Demon Dukes became S-Class Demon Kings for the same reason. So, if powering up by evolving causes similar class increases, becoming an SS-Class Ultimate Slime evolves you into a Demon Lord of a similar class, a SS-Class Great Demon Lord.

That being said, if Guy is a Demon God, which is also SS-Class, than he logically should be a Great Demon Lord too if that is all it took, but only Kazarem has made claim to being a Great Demon Lord, and that was probably because he had Demon Lord-Class subordinates like Rimuru does. The difference is Kazarem's were only "Self-Proclaimed Demon Lords" while Rimuru's as actual Awakened Demon Lords. That is probably why Kazarem and Guy never became true Great Demon Lords.

So to be honest, Rimuru is lucky because he had the means to both evolve himself and his subordinates. That's probably why he is the only Great Demon Lord despite other Demon Lords being SS-Class and other ones having Demon Lord-Class subordinates.