Which character is the wisest in Twelfth Night?

The answer to this question concerns my favourite
character in this play: Feste. As always with Shakespearian fools, they often, under the
guise of their foolishness, show far more wisdom and intelligence than the other "wiser"
characters they are there to supposedly "amuse." A key speech to consider in the
character of Feste is Viola's soliloquy about wisdom and folly that she delivers after
talking with Feste in Act III scene 1, when she is disguised as
Cesario:

This
fellow is wise enough to play the fool,

And to do that well
craves a kind of wit.

He must observe their mood on whome
he jests,

The quality of persons, and the
time,

And, like the haggard, check at every
feather

That comes before his eye. This is a
practice

As full of labour as a wise man's
art;

For folly that he wisely shows is
fit,

But wise men, folly-fall'n, quite taint their
wit.

Note how this is
actually a rumination on the role of the fool and how intelligent and wise fools need to
be to play their role successfully. Many productions play Feste as a character that
actually is able to work out what is going on. It is strongly suggested in places that
he sees through the disguise of Cesario, and the fact that he travels between the two
households, performing for both Olivia and Orsino, suggests he is able to take a global
view that other characters lack, therefore giving him knowledge about what is going on
in Illyria. Therefore, for all of these reasons, Feste is most definitely the wisest
character in the play.