Who is the hero that "uses" the soulstone at the end of Diablo?

Spoiler alert! Don't read if you haven't completed the original Diablo from 1996.

At the end of the original Diablo, the hero shoves Diablo's soulstone into his or her forehead. That ending is identical for any hero choice. Is there a canonical "which hero it was" fact in Diablo II? e.g. do we know that it was a warrior that used the soulstone, and subsequently became the host for Diablo's new form?

Solution 1:

From what I remember, and this forum thread agrees with me is that

• The Rogue became Blood Raven, a minor super unique quest mob from Act 1 of Diablo 2
• The Sorcerer became The Summoner, Horizon's impersonator, a super unique quest mob from Act 2 of Diablo 2

This leaves the most likely outcome, the bulky Warrior became the canon Diablo in Diablo 2.

Solution 2:

In Diablo 1 King Leorics son Prince Albrecht is kidnapped, driving the king mad, and used to give Diablo a human form by plunging the soul stone in to him, but he is not strong enough to let Diablo escape the dungeon. The warrior is his brother Prince Aidan and during his decent down in to the dungeon he is corrupted in to believing that the only way to control Diablo is to plunge the soul stone in to him self, but this is just a trick by Diablo to get a host that is strong enough for him to get out of the dungeon.

If you want more of the backstory i sugest watching this 3 part video: Pre Diablo 1, Diablo 1 and Diablo 2