Yes, totally. And he was probably ran into Aenir and Nergal back in the day, just so he could be mean to them, too. (To be fair, I expect Jahn probably WAS harshly against Aenir's generosity to humans if he ever heard of it, so that would be actually IC...)

And he ~clearly~ manipulated poor woobie Zephiel, too. What are these Omnicidal Maniac tendencies you speak of? CLEARLY JUST JAHN'S EEEEVIL INFLUENCE!

I know, right? So many choices, each as horrible as the last.
But so gloriously brain-scarring! (I think this conversation may be the first time anyone's thought up Kishuna/Nils...)