Nailman

The Nailman is a blue-skinned biped covered in blood, with several nails embedded within its skin. It holds a hammer and a nail, and the corners of its mouth are nailed into its face in a permanent grimace.

Gimmick
It will hammer nails into surfaces, which explode into a bunch of smaller nails when they come in contact with the Player, physics props, or other enemies. It does this when it is not directly threatened.

It attacks by hammering nails at the Player from a distance, throwing a nail in the air and hitting it with its hammer. This projectile attack knocks the Player back a great deal, pinning them to walls if they are pushed against one. When pinned, the Player will be immobile for 1 second, and the Nailman shoots a nail every 2 seconds, so they will have but one second to escape.

Variants
Nailman comes in several forms.

Nailman
The standard Nailman experience.
 * HP: Medium
 * Speed: Slow
 * Damage: Average (Projectile) to Good (Wall Nail)

Boltboy
Filled with youthful energy, it moves much faster and fires nails every second. Will cease fire after a pinning shot, but will fire 3 nails at once after 2 seconds.
 * HP: Medium
 * Speed: Fast
 * Damage: Good (Projectile) to High (Wall Nail)

Screwperior
A superior screw, it can drill a hole in the ground and tunnel around, effectively teleporting wherever it wants. The projectiles it fires also travel faster, and it will pause after a pinning shot for 3 seconds, and then fire 5 nails in rapid succession, which travel mostly in a straight line, but stray from the central angle by up to 10 degrees. It drops the Nailgun.
 * HP: High
 * Speed: Average
 * Damage: High (Both)