Junior Cadet Nirol serves no current purpose, but perhaps he could be a future recruiter for gnomes. In the conversation with Junior Cadet Nirol, Nirol states "Pfft. Just wait 'till my gnome unit comes back from battle, then I'll show 'em." This could hint at a possible gnome squad in the future. The use of a gnome unit is unknown as the current units already cover all three (3) points of the combat triangle.