There have been TONS of demons that Iruma's talked to who have compared him to the previous demon king and found similarities to traits they liked, but I think this is the first time someone has been interested in Iruma for his *differences*.
I think I like Mephisto just for that!
It's always refreshing when someone looks at a character and sees them for who they are, not who they're constantly being compared to.
Iruma does have a lot of similarities to the previous king, but he is also a fundamentally different person who is (more likely than not) going to rule over a very different underworld than the one Delkira has created.
I'm really glad he could see that!