
So how have you guys been pronouncing Dietrich? At this point the pronunciation is driving me insane

Can literally look up how to pronounce it:
https://youtu.be/2h6zlNWod2w

Who is that guy? The guy from the auction right? Or no? I don't know or remember? Should we know or remember? He wanted to eat her or something right? He wanted some type of revenge? What kind of revenge? Who is this guy again? We saw him in past chapters right?

Abartia is the guy from the auction, it was revealed he was the demon Gluttony who ate the other Six monarch demons. Archmage fought him before and locked him up but due to her mana being sealed now he managed to escape. He is kinda obsessed with the Archmage cause she was the only one who managed to fight him head on so now he wants to fight her again but only when she is in full power as well so for the moment he just wants to be close to her hence he possessed the original Hakman and is using his body and kingdom to propose to Enisha, and is kinda creepy about it hence the 'I wanna eat you' part.
Hope that helps.
You. Are not. Getting this. At. ALL. Ah whatever he seems sweet it's cute.