BioShock 2/Enemies

Splicers
Splicers are humans who have gone insane by using too much ADAM. They are vulnerable to anti-personnel rounds.

Thuggish Splicer
Thuggish Splicers only have melee weapons such as wrenches.

Leadhead Splicer
Leadhead Splicers carry a gun: either a pistol, machine gun, or shotgun. They can also throw grenades or molotov cocktails.

Brute Splicer
Brute Splicers are strong and fast. They throw large objects at you or charge in to attack up close.

Spider Splicer
Spider Splicers can crawl on the ceiling as well as throw hooks. They also often come in close for melee attacks.

Houdini Splicer
Houdini Splicers use elemental attacks such as fire or ice. They use teleportation to avoid attacks.

Security
Security includes the various cameras, turrets, and bots you will encounter throughout the game. They should usually be hacked instead of destroyed, but are vulnerable to armor-piercing rounds.

Big Daddies
Big Daddies protect Little Sisters. These enemies are vulnerable to armor-piercing rounds. They will not attack until attacked first.

Bouncer
Bouncers use drills for close range attacks.

Rosie
Rosies use rivet guns as well as proximity mines.

Rumbler
Rumblers throw out mini-turrets and grenades, but can also charge in for melee attacks.

Big Sister
Big Sisters are fast and powerful enemies that appear when the last Little Sister from each level has been rescued or harvested. They can use Telekinesis and elemental plasmids to attack. They are vulnerable to armor-piercing rounds.

Alpha Series
Alpha Series Big Daddies attack using some of the same weapons as the player. They are vulnerable to armor-piercing rounds.