The stout and stern leader of the Gungans, Boss Nass was a proud keeper of his people's ways. His booming voice issued decrees on behalf of all the Gungans of Otoh Gunga. He kept a tight rein on Gungan affairs, continuing a longstanding custom of isolationism. Ages ago, a cultural misunderstanding led to a rift between the Gungan and the Naboo colonists. This tension was perpetuated by stubbornness and ignorance on both sides.
Though Nass' temper is short, he is not entirely close-minded. Displays of courage and humility can pierce through his preconceptions. When Queen Amidala prostrated herself before the Gungan leader to request his aid in fighting off the Trade Federation invasion, he was impressed. The Naboo didn't consider themselves superior to the Gungans, after all.
Nass committed the Gungan Grand Army to wage war against invading battle droids. When the Trade Federation was repulsed from Naboo, Nass joined Amidala in a huge celebratory parade that united the Naboo and the Gungans in a new era of peace and cooperation.