Ariadne Oliver! I went hunting for her complaints about her detective:

"I only regret one thing, making my detective a Finn. I don’t really know anything about Finns and I’m always getting letters from Finland pointing out something impossible he’s said or done."

"And they say how much they love my awful detective Sven Hjerson. If they knew how much I hated him! But my publisher always says I’m not to say so."

"How do I know why I ever thought of the revolting man? I must have been mad! Why a Finn when I know nothing about Finland? Why a vegetarian? Why all the idiotic mannerisms he’s got? These things just happen. You try something – and people seem to like it – and then you go on – and before you know where you are, you’ve got someone like that maddening Sven Hjerson tied to you for life. And people even write and say how fond you must be of him. Fond of him? If I met that bony gangling vegetable eating Finn in real life, I’d do a better murder than any I’ve ever invented."