Actually, there used to be an omake series on FF.net featuring Naruto as one of Laharl's vassels (he got sent to Laharl's castle as a young child). Unfortunately, the author's account seems to have disappeared...
Edit: As a side-note, the whole spaceship thing isn't all that impressive when compared to some of the OTHER things Laharl is revealed as capable of. In Disgaea 2, for instance, Laharl is shown to be able to casually destroy a planet...-- This message brought to you by Ely Lilly, makers of SeraFem: Happy Pills for PMS.
Edit: As a side-note, the whole spaceship thing isn't all that impressive when compared to some of the OTHER things Laharl is revealed as capable of. In Disgaea 2, for instance, Laharl is shown to be able to casually destroy a planet...-- This message brought to you by Ely Lilly, makers of SeraFem: Happy Pills for PMS.