Darkwing Duck/Enemies

Bat

 * Found: The Bridge

Green caped knife throwing duck guy

 * Found: The Bridge

Patrolling duck guy

 * Found: The Bridge

Slug

 * Found: The Bridge

Turtle Racer
They start inside their shell. Once you get close enough horizontally (you don't have to be at the same height) they awaken, charge up and then race away towards the direction they were facing.
 * Found: The Bridge