Sleuth

Sleuth is a slim, mostly skinless figure, with hollow eyes and a sharp grin. Bright red veins snake across its hands and face.

Gimmick
The Sleuth leaves a trail of damaging fluid wherever it goes, and its tracking radius is smaller than usual. It can vanish underground and leave a large puddle where it previously was, and then travel mostly unseen, though it still leaves a conspicuous trail of damaging fluid. When it finds the Player, it will track them down and only emerge from underground when it gets within attacking range.

Sleuth

 * HP: Below Average
 * Speed: Sluggish
 * Damage: Low (Fluid) to Average (Melee)

Investigreater

 * HP: Average
 * Speed: Average
 * Damage: Average (Fluid) to Above Average (Melee)

Private Eye
This variant actually has eyes. When underground, it may spontaneously stop in place and create a large geyser or blood where it is, creating puddles in the vicinity.
 * HP: Resilient
 * Speed: Quick
 * Damage: Above Average (Fluid) to Good (Melee)