I was a little shocked too when i read about this, but Laharl ended up being a great Overlord and more or less stable. One would think that when he got the tittle of Overlord he would like to punish his aunt, but it seems he didn't do it, good for him.

And this is a little bit off-topic but, i want to ask the people that already read the light-novels something.
In one of the novels (i think it's one before Laharl travels back in time) Laharl is invited to visit Celestia by Lamington and there he meet Flonne's family, could someone tell me more about Flonne's family? and what was their reaction when they meet Laharl and Etna please?
Thanks in advance ;)