Slavery. The MC is in a fantasy world (isekai or not) and gets slaves and such.
From a narrative point of view it seems like a very sloppy way to create a relationship between the MC and the other characters. The author does need to come up with dialogs or progress the way characters interact...
Among the ones I'm currently following:
Ao Ashi - football manga, much better than the shitshow that ia the real football
Dandadan - because it's completely crazy and the art details are really nice
Akane Banashi - because it's fresh