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if anyone is wondering what happened to the warrior rogue and sorcerer from d1 here you go

According to Diablo II, the canon hero who defeated Diablo in Tristram was a Warrior: the wanderer who is posessed by the Lord of Terror is clearly a man, ruling out the Rogue. His skin is pale, edging away from the dark-skinned Sorcerer, and in the opening cutscene, the wanderer leans on a sword, the weapon most closely associated with the Warrior. and we all know what happens after that, warrior decomes diablo, then is killed by you

Blood Raven (the corrupted Rogue from the first act of Diablo II) was evidently the Rogue in the first Diablo game. Kashya's rogue scouts say that their captain was in the battle with Diablo at Tristram and was corrupted by Andariel soon after.

Summoner (the corrupted Mage from the second act of Diablo II) was evidently the Sorcerer in the first Diablo game. After you defeat him Cain says he remembered that there was a Vizjerei who fought against Diablo and assumes that he was corrupted.