RoboCop Henderson: '24'
Age: late forties
Death Count: Unknown, but probably a lot.
Strengths: Robocop's armor and weapons combined with Biff Henderson's unrepentent evil. Snappy catchphrase "Dead or alive, you're coming with me!"
Weaknesses: Vulnerable to strong electro-magnetic fields
Comment: If he killed Evelyn's little girl, he needs killing.
Master Chief: 'Halo'
Occupation: Cyborg Super Soldier
Death Count: Um, how many thousands of people were on the first Halo, and on the Covenant Cruiser, and how many did he kill in between?
Strengths: Superhuman strength, regenerating protective force-field, artificial intelligence, proficiency across a wide range of military weapons. Might even stand a chance against Jack.
Weaknesses: You can get around him if you know the shortcuts.
Comment: You think terrorists are bad? Try fighting eight-foot super-lizards with plasma machine guns.
Originally, I was going to do this as Jack Bauer versus Master Chief (inspired by this hilarious, obscene, and definitely NSFW video at YouTube), but I figured it would eventually come down to Chloe hacking into the mainframe and disabling Cortana, leaving Master Chief helpless. So, I decided, hey, Biff Henderson/RoboCop, Cyborg versus Cyborg, that has possibilities.