Yes... Jeeves and the Rough Stuff.... maybe something sandpaper or chin stubble based?

Jeeves and Bertie are both kind of morally flexible... after all Bertie spent his formative years pinching biscuits and sneaking looks at his friends' school records. But you are right about the sometimes almost sinister aspect that seems to be lurking behind Jeeves... although I am not at all convinced he'd actually murder anyone.... but I did sort of like that story where Jeeves embezzles all Bertie's money and then runs off with him.

Agatha is misguided (and actually rather mean) so I don't feel very fond of her, but I do understand her points--Bertie really does need to prepare himself for the real world and he is giving Jeeves ideas above his station...