Uncharted 2 reference
Doughnut Drake is a massively overweight version of Nathan Drake. His voice is also much deeper than Drake's voice.
How to unlock
In Among Thieves, Doughnut Drake can be bought in the single-player skin store. He can also be purchased in the multiplayer store for the expensive price of $2,000,000. In multiplayer, he can only be purchased after the player has reached level 60 (X).
In Drake's Deception, can be unlocked on the Monastery Co-op adventure in the hard or crushing mode. (The hematite skull bead treasure is no longer glitched, as of the 1.04 update in early February 2012)
It can also be unlocked by beating the remastered versions of Drake's Fortune, Among Thieves and Drake's Deception on the normal difficulty.