 If you liked
Maoujou de Oyasumi
|
 ...then you might like
Maou no Hisho
|
In both of these manga shows the comedy between a human and demons. They both feature a protagonist that is more 'Demon' than the demon lord. Though set in a fantasy world where heroes and demons fight each other, there is hardly any violence portrayed, making these manga a good lighthearted comedy.