Petit Snakey (プチスネーキー) is a snake enemy, much smaller than the Big Snakey. They are found in Snake Man's stage and shoot projectiles at Mega Man. Where they will shoot depends on Mega Man's location when they blink.
Big Snakey (ビッグスネーキー) is a giant snake sub-boss. Their 'tail' acts as the floor which moves and wriggles about up and down which can either disorient the player's line of fire or help them get a clearer shot.
Ladder Press (ラダープレス) is a spiked hand-like press that goes up and down in a ladder opened, and closes in the borders of the ladder. They can't be destroyed and do not freeze with Spark Shock. They appear in the Snake Man's stage.
Potton (ポットン) is a flying surveillance robot that attacks by dropping their explosive body when Mega Man passes under them. Afterwards they are just glass shells with propellers that fly around. It still hurts Mega Man if he touches them.