I need somewhere to put my hat.

Hello.

Today I am asking for help in finding a series or film with a character who is... well, insane. Not just a little eccentric, I mean full on, brain gone, babbling, insect eater.

I can't seem to think of any examples because my memory is sieve-esque.

I have no specific genre/gender in mind. It doesn't necessarily have to be the main character (I imagine it might be quite difficult to establish a plot whilst the main character is concerned about the shifty looking satsumas singing sea shanties)

Thank you.