Orcs as the champions of good? Cool.
Long ago when the world was new, the gods fought to claim the world from the Demon, the Aberration, the Fae, and the Dead. Their victory was total and the time came to divide the spoils. Moradin claimed the mountains and hills for the dwarves using his muscle and sweat. Ao and Yondalla together claimed the lush gardens and fields for the humans and halflings sacrificing their life together. Corellon Latherion cut their own flesh and marked the woods with their blood for their people the elves. Gruumsh looked around and saw dwarves digging deep and unleashing horrors from below. The humans recklessly used sorcery to summon demons and elementals from beyond. The Elves engaged in a civil war and brought untold darkness from the Feywild. The battle for the world was won, but the war continued. Gruumsh saw this and sighed. He plucked out one of his own eyes in sacrifice for the orcs. "My people will dwell everywhere, but they will keep watch and protect this world and its peoples from those who would invade it." The orcs were spread around the world, but they were all charged with a sacred task to always fight the Demon, the Aberration, the Fae, or the raider from the stars who sought to take what was given to them by the gods.
Orcs value strength. The strong guard the weak. Strength is to break chains, not bind. The strong can carry the weight of the world.
Orcs value family and clan. The world needs its defenders and only the clans are charged with the defense of the world. The other races are subject to corruption and temptation. Blood of Gruumsh will keep you safe.
Orcs are passionate. Life is to be enjoyed and celebrated. Quick to anger and quick to laugh.
So you have clans of orcs living anywhere next to the other races acting like Team Gruumsh World Police. They tend to be a bit condescending to the other races who they think act like children without regard to the repercussions of their actions. Their whole society is built around training for the next threat. Their shamans are diviners and abjurers. The Eyes of Gruumsh are powerful berserkers to fight planar threats. They tend to avoid most other schools of magic except to counter. Magic is a threat to the world, it must be used sparingly and correctly.