I had played the game, Disgaea: Afternoon of Darkness on my PSP some time ago, and I liked the story. So wondering if there were other related media for this (as usually is the case for good JRPGs, and in some instances, popular fighting games as well), I sought and luckily, I found!
It's really more on the funny side, and not much serious, which is actually a good thing, since this is what makes the series work for me. I dislike series that try to make a story based mainly on comedic elements incorporate or even twist itself into something deeper, which of course wasn't how it was meant to be in the first place.
I like the dynamics of the trio: Laharl, Etna and of course Flonne and also the usual appearance of Vyers, or better known as "Midboss-san"...that made me laugh more times than any other "element" in the manga actually. Plus Laharl's trademark laugh, ah, but it's better to hear it, so the anime would be better for that.
Basically what I liked: the hilarity of the story. The serious sides are better done in the anime or better yet, seek the game!