The categorical dual of a monad is a comonad. A comonad is therefore a functor with natural transformations counit and...
Wait, never mind.
Comonad is a guy. He is
not also
The Guy. He started the pages for
Starcrash,
Scripted Battle, and
That One Attack.
He's currently running a liveforum/liveblog/let's play/whatever of Planescape: Torment
.
A member of
KNIVES.
This troper provides examples of: