Ankiron

Ankirons are the strongest enemies, excluding bosses that Wario fights in the game Wario World.

Ankirons resemble huge armored turtles with cannons sprouting out of their shell. In fact, Ankirons are so huge, all they can do is turn in place. Ankirons can also hide in their shells to protect them against Wario's powerful punches. Ankirons will fire cannonballs at Wario, but he can throw the cannonballs right back at them. The cannonballs explode after a short time, however.

Other varieties of these enemies include Skeletal, Circus, Ice, Bullock, Stuffed, and Mummy Ankirons. Aside from looks, Skeletal and Ice Ankirons behave exactly the same way as normal Ankirons. The Stuffed variety can fire many cannonballs at once, while the Circus, Bullock, and Mummy Ankirons shoot lethal, fiery cannonballs.

Wario also comments that they smell like feet.