Lumbrum pilots for the Red Snappers, the elite NESS combat unit specializing in competitive space battles. She fights alongside her three sisters, their shared unit identity reflected in names each meaning "red" in a different language; Lumbrum's name derives from the Latin word for red.

A defining aspect of her combat behavior is the audible apology she utters every single time she activates her starship's weapons systems. This pattern of apologizing while executing attacks characterizes her role. Her operational history within the series is confined to the first 20 episodes of the television continuity.