Plasma Kirby's attacks revolve around firing off green electricity. Unlike Spark, Plasma charges up and fires off lightning bolt projectiles. If fully charged, Plasma Kirby generates an electric field that projects him from projectiles and enemies. At full charge, plasma has infinite range. However, the charge is passively lost over time.
In Kirby Air Ride, the ability does not lose charge over time but, does not generate the shield. Kirby can not charge his air ride machine without firing with this ability.