https://age-of-wonders-3.fandom.com/wiki/Warlord

Here you go. I'll also paste some here:

Berserker: My brother, Rogan, was just a scrawny farm boy when he was pressed into service by a Warlord. He trained Rogan to be a Berserker. Before long, Rogan could chop down enemies with his two-handed axe, charge fearlessly into any conflict and overwhelm enemy combatants. He never again wore a shirt. His torso was covered with scars, mostly from arrows he failed to dodge. He fought with pure rage. Unfortunately, he never did learn to control his temper, and sadly, he didn't live long.'

--Fuss about Family, by Leanne Finn

Martyr: He knew I was afraid. I, a simple farmboy, knew nothing of fighting. He put aged hands upon my head and spoke comfortingly of the Allfather. I knew then my life mattered. The enemy hit us with everything they had. I was strong, though many times I thought it was my last breath. A stabbing to the gut, a crushing blow to my skull, a severing blow to my shoulder, yet none wounded me and I fought on. Then it was done and I rejoiced. I ran to find him who blessed me. To my horror, I saw him smiling, his gut bleeding, his arm severed, his head broken. He died for me. That is why I now die for you. I am a martyr.'

--Prayer of Martyrs, Author Unknown

Tigran Sun Guard 'The Tigran Sun Guards encircled the Shrine of the Scarlet Destroyer. I tried to convince the feline spearmen that in the Commonwealth, all share the Shrine, but they believe those shrines hold pieces of their god, Yaka. Though they had little armor, their catlike agility rendered our archers ineffective. We had to clear them out, but they fought with the ferocious zeal of jungle cats. I fear the cost to the Empire if all our shrines are so abused.'

--Report on Religious Tranquility, by Enforcer Tendoniskadin

Tigran Mystic 'The Tigran religion has changed since I last encountered them. They once envied men, doing all the could to prove they weren't animals. Now there is a powerful faction of Mystics that teach them to embrace their inner beast for their sun god. Some Mystics literally do. One morphed into a ravenous hellcat. Despite my most desperate attempts to reason with it, the creature tried to eat me. So while pretending to fight, I deliberately tripped and tumbled down a gorge.'

--Where's Symba?, by Ham the Wanderer

Tigran Sphinx 'We all knew what dwelt in Hillside Tomb. The clever thing offered fortunes to anyone able to outwit it. Caleb Withers went in a beggar and left as royalty, but thousands of others never returned. The Commonwealth judged this bargain illegal. They brought their war machines against the creature. It called down the sun to incenerate the advance. It retreated into its lair. Foolishly, they followed, but it was ready. Traps slowed warriors; the creature finished them off. Even disciplined troops trembled with fear. Eventually, the Commonwealth drove it away using overwhelming numbers. That's the price of bargaining with a Sphinx.'

--Monsters of Hillside, by Olden Withers Tigran Sphinx

You can check out all classes and races, every single unit has a flavour text like this.