Bouncing bundles of electricity, Sparkys bounce right up beside Kirby and zap him unless he moves. Be careful when you're close to them because they can jump nearly as high as Kirby can.”
Sparkys are green creatures with teardrop-shaped, blob-like bodies. They have little black eyes located at the bottom of their body (originally ovular-shaped, but as of Kirby's Return to Dream Land, more circular in shape and slightly larger). They also have two light greenish-yellow orbs that are surrounded by electricity (in the original version of Kirby's Adventure, these orbs were originally another pair of eyes; in later games, this idea was scrapped). These electrical orbs could be presumed to be how Sparky creates its spark attack, and could also possibly be its hands (seeing as how many other enemies have spherical hands).
Sparkys were originally generally either a lime green or a bluish-green color. However, in Kirby's Adventure and its remake, Sparkys also come in other assorted colors like blue, yellow, and lilac; their original standard color was bright pink. As of Kirby's Return to Dream Land, Sparkys are now a bright lime green color.
Sparky debuted as a common enemy in Kirby's Adventure where they provided the Spark ability. Unlike many of the other common enemies such as Waddle Dee or Waddle Doo, Sparkys will not just walk off in one direction regardless of what happens, but slowly make their way towards Kirby trying to bump into him deliberately. Because of their lack of legs, they move by taking small jumps from place to place or one large hop which covers more distance.
When Kirby gets too close to the Sparky, it will create a small electric field that shocks Kirby causing him to bounce along the ground stunned for a moment. This is usually just a minor inconvenience, but can be dangerous if Kirby is near a bottomless cliff or annoying if Kirby loses his Copy Ability since there will be less time to gain the ability back and more of a chance of the lost ability getting away.
Sparky appears as an enemy in Stage 3. It hops up and down or side to side and grants Kirby the Spark ability when defeated. It is the only source of this ability outside of the Changeritem. Sparky also appears in the "border line cleared" animation. It hops after Bouncy, seemingly late for the parade.
Sparky is generally regarded as the main provider of the Spark ability. As such, they appear in all games which feature said ability; their behavior is generally unchanged from game to game, and will usually bounce around slowly and generates an electric force field as means of attacking Kirby.