JJ1
JJ1 had lots of weird enemies, like enormous owls that bounced you off platforms instead of hurting you, enormous turtle shaped tanks, blue carts which rolled back and forth firing blaster bullets into the sky, flying machines which fired RF Missiles at you, living fireballs jumping out of the lava, gun happy turtles riding back and forth on top of airboards, and lots more. JJ2 had a few nice ideas, like Tube Turtles and the Witch, but for the most part it just used simple animals.