List of Wario Land 3 pre-release and unused content
From the Super Mario Wiki
This is a list of pre-release and unused content for Wario Land 3.
Kushimushi has unused graphics showing flapping wings, possibly intended for flying; however, they may also be for a stunned animation, as in the final game Kushimushi falls off the screen when attacked.
Spark has graphics that seem to be for a defeat animation; in the final game, Sparks are completely invincible. There also exists graphics for them moving their eyes left and right.
Denki have unused sprites for either being stunned or defeated, neither of which can occur in the final. They show eyes, hinting that Denki are actually alive.
Tadpoles have two unused graphics, one showing one with an angrier face, and the other facing the screen, possibly as a turning animation.
Water Sparks have an unused death frame.