With the reveal of Half Elf's mother just around the corner, i tho8ght i should post my theory that I've not been able to get out of my head. This is almost definitely reading too much into everything.
Half Elf's father could possibly be one of the Dread Templars.
He's the only other person besides the templars themselves that have black hair.
He has a preference for being 'Good'... every Templar has 'Good' in their title.
The Good Poet.
The Good Priest.
The Good Commander.
The Good King.
We don't know how elves or half elves age, its possible they age slower. Regalia is at least over one hundred years old, probably more since Ellomin citizens call her 'Old Regalia' in the song 'Ellomin' - 'raise a glass to Old Regalia, wherever she may be'
Regalia never mentioned how long ago she found Half Elf or where (besides from in a fallen tree)- Many years back in a tree that had fell, she found a baby, a half mutant elf'
And on THAT note. This confuses me the most. 'She tried to give him name but God rejected
He took absolutely no damage from falling down a deep chasm (but then again, Tamion seemed to be uninjured from the fall, too)
It's seems awfully convenient that Half Elf was missing from the first Templar fight, almost like fate was interfering. THEN The Prophet seems pretty adamant that Half Elf keeps away. (His prophecy didn't mention Martin or Bear Hound, so I hope they're both okay)
He was only out of breath when Bear Hound slashed at his spine. No claw marks or scratches. I'm presuming that Timmund's blade is the only thing that can hurt the Templars.
If there are any holes in any theory at all, let me know. I want more things to think about.
Obviously, everyone is welcome to add on to this or post your own theories. I welcome them very, very much.