Rocky is a member of the Vehicle Voltron. He is part of the Air-Sub Team, and his vehicle forms the upper torso of that Voltron. He is known to eat a lot and is nice. He is friends with Hunk from the Lion Voltron. He and Hunk have many similarities. He operates the Strato Weapons Module (#2).
Voltron: Defender of the Universe cartoon continuity
Vehicle Force sub-series
Rocky was sparring partners with Hunk in their academy days.
Devil's Due Publishing comics continuity
Rocky was one of several people chosen to pilot the machine named "V-15" by Galaxy Garrison, he and his team were first deployed after the original Voltron to recapture it until he received new orders to support Voltron.