Still waiting for people to suggest Gene Tonics. In the meantime...
Solid Snake
Class: Demoman
Master: Unknown
Alignment: FOXHOUND (former)
Noble Phantasm: A+
Strength: B
Endurance: B
Agility: B
Mana: N/A (SCIENCE!!)
Luck: B
Skills:
CQC
Rank: C
The close quarters combat style developed by The Boss and Naked Snake allows for a soldier to incapacitate, disarm or kill his or her enemy using fisticuffs while remaining armed and capable of dealing with ranged threats at a moment's notice.
Bomb Proof
Rank: A
How do you tell good Demomen from bad ones? The good ones are still alive! Being bomb proof certainly helps; Snake's reflexes, intuition and skill protect him- from explosions of his own creation, and greatly lessens damage sustained from other kinds of explosions.
Noble Phantasm:
C4
Rank: B
Completely normal C4... boosted to Servant-killing power through the power of the Demoman class. Snake has a wide array of detonation methods: timers, proximity sensors, remote control, pressure, and a few more.
The Patriot
Rank: B
The Patriot is a very powerful modified XM16E1 assault rifle, with a shortened barrel and the odd addition of the infinity symbol where the magazine loader normally is. This gives the gun infinite ammo. The Patriot is partially silenced, suffers little kickback,
The Cardboard Box
Rank: C
Perfectly normal cardboard boxes, when used by Solid Snake, becomes tools beneath which Snake can hide his presence. As long as Snake hides under it and keeps out of people's way, unboxlike behavior will go unnoticed.
Metal Gear REX
Rank: EX
A nuclear missile armed walking tank, Metal Gear REX was first defeated by Snake on foot, then commandeered by him years later to defeat Metal Gear RAY. REX is armed with a railgun by which it fires its nuclear missiles, a high powered laser, missiles on its knees and back, 30mm Vulcan cannons and a "Street Fighter" program was added later to allow REX to use melee attacks effectively. A radar and sensor array outside the machine allows the pilot to hide safely inside a heavily armored central cockpit, but is itself vulnerable to attack.
This Noble Phantasm is so powerful that it's use is not decided by Solid Snake. Rather, in order to use it his master must order him to use it, and sacrifice all three of Snake's Command Seals.
I expect reactions to be go something like this:
METAL GEAR?!
METAL GEAR!!
As I'm not really a big MGS fan, details that need changing should be reported ASAP. Any skills that he ought to have?