Big Boss :MGS PEACE WALKER: This guy started an army from scratch, eventually building to power, (forming what later becomes Outer Heaven) and they become a seventh nuclear power, even have a metal gear of their own. In other words this guy can easily set up an army and get things done with limited supply and resources.
Spawn: Spawn Comics: This guy is pure badass, capable of killing just about everything with ease, was even known to have banished both God and Satan to another existence, obtained godlike power afterwards but gave it up just to save the world. Easily capable of adapting to many combat situations.
Dante : Devil May Cry 1-4: Despite a little arrogant, he specializes in demonology not to mention is the son of Sparda, although Dante has supposedly passed his father's capabilities, Dante has proven to be effective with just about every weapon from swords, hand to hand based weaponry, spears and even his trademark pistols Ebony and Ivory. A must have for any team.