@nachtness just wait, it will happen. He's a piece of shit and the world won't miss him when he's gone. Unfortunately, with the pace of this manga, God knows what YEAR that will happen... by 2030 if we're lucky...
For example,
I believe the princess from the country that was just conquered will eventually join Ark's harem as one of his generals in the war against the Empire if i am remembering foreshadowing from a later chapter right
Also, as for Aurelia's asshole brother and father,
they might be next after the current elf country arc. Ark sends the glasses woman to see him for a summit or formal party or something like that (after powering her up of course). My gut says it's likely that the old man will take her prisoner for a stupid reason, requiring Arc to torch the place with his expanded Nacht harem (the red-head swordswoman comes home and brings the mage girl with her). So, hopefully the brother and father die in 2021.