Compare and contrast Touchstone and Feste

As You Like It's Touchstone and Twelfth Night's Feste are alike in that they are both court fools. As fools, it is their job to entertain through wit and song, and Feste, especially, is noted among Shakespeare's many fools for being clever. "Fool" is a bit of a misnomer; both of these characters prove to be quite smart.
Touchstone begins the play working for Duke Frederick in court, but ends up running away with Rosalind and Cecilia, and, in the forest where things like class and status become unimportant, he becomes almost their equal, a partner in crime with the two girls.
Feste serves the Lady Olivia and, as a "licensed fool," has free rein to say whatever (and make fun of whomever) he wants. Though Feste, for his part, never becomes equal to Olivia, the lack of censorship imposed on his wit gives him a fair amount of power. He also bands together with Sir Toby and Sir Andrew in their cruel prank against Malvolio. So another similarity between the two fools is that they both join in on schemes with characters who are not strictly their masters and get up to mischief.