Yep. The adventurers in D1 were just that, adventurers. Not princes, half-demons, or anything like that.
In D2, the Rogue and the Sorcerer from D1 ended up corrupted, becoming Raven and whatever-the-mage-in-the-Arcane-Sanctum-was-called.
In D3, now alluva sudden the D1 Warrior was the...