Dr. Rodney McKay (PhD - two, actually) is the Chief Scientific Advisor on the Atlantis expedition. He has extensive knowledge ranging from Ancient technology to Stargate travel to naqadah to Wraith ships to theoretical physics to not-so-theoretical physics to...pretty much everything, really. And what he doesn't know probably isn't worth knowing.
Rodney is vaguely round, thanks to his constant eating, is about 5 foot 11 inches tall, has brown hair he has taken to mussing up in what he imagines to be an attractive sort of way (hey, Sheppard does it) and blue eyes. He would tell you that looks don't matter, but that's only because he doesn't look half as attractive as he'd like to be. He makes up for it by being devastatingly smart, however.
McKay comes to the island from the end of the season four episode 'Doppelganger' (4x04).
Inventory -Several wires and electrodes stuck to various parts of his body -Shirt -Trousers -Underwear -Socks -Boots
Disclaimer: NOT REAL. Rodney McKay belongs to the creators of Stargate SG-1 and Stargate Atlantis and David Hewlett belongs to me himself. I am simply borrowing them for roleplaying on the_blank_slate. The end.