When unlocked, Sparx helps the Skylanders by attacking enemies and surrounding objects with fireballs. When an enemy is hit by Sparx's fireballs and is later defeated, they will turn into a butterfly which Sparx will eat (only in the Wii version of Spyro's Adventure), while in the other console versions, he kills them for the Skylander to eat, allowing them to regain their health.
Sparx is one of the two known characters, besides Spyro, from the classic series to appear in Skylanders.
Fans thought Sparx wasn't going to be in Skylanders until he was first mentioned by Skylanders' Creative Director, Paul Reiche III, in a GameReactor interview, and a picture of him was later revealed on the webgame of Skylanders: Universe.
Sparx's role as a magic item is similar to the role of his Classic counterpart, except the Skylander eats the butterflies to regain health instead of Sparx (as previously mentioned, Sparx eats the butterflies in the Wii version).
Sparx's ability to breathe fireballs also references his classic counterpart in the original series, who also attacks by breathing fireballs.
He also communicates by buzzing, much like his Classic counterpart.
Additionally, his Classic series voice actor, André Sogliuzzo, did the voiceover work of Sparx for the game.
Sparx also has more animations on the Wii version of Spyro's Adventure than the other console versions.