Tyrael's mortal form wasn't just some random dude

The Book of Cain has incredible lore and art, One of them includes Uldyssian who's moments away from his self-sacrifice at the end of the Sin War.

It was his sacrifice that made Tyrael vote in favor of humanity, and apparently Tyrael's appearance when he decided to be a mortal.

Here's a blue post confirming that he had control over what he would look like as a mortal.

http://us.battle.net/d3/en/forum/topic/10490039198#15

And then there was a deeper meaning behind Tyrael's mortal form, a visage who once belonged to a Nephalem whose self sacrifice made Tyrael admire humanity and see its potential for good.

Posted in: lore