So SPOILER discussion below so SPOILERS if you go beyond this point....
So at this point we can guess Anet already has planned for someone among our three Charr good characters to die.
Either Rytlock, Ryland, Crecia, or maybe two of the three. After all Anet just loves killing off characters as their way for them to "retire" from the storyline either physically or mentally coughZojjacough instead of actually retiring alive and healthy to live through the rest of the storyline peacefully.
So who do you think among the three will die?
My best guess is either Rytlock or Ryland.
Rytlock choice is more due to Ryland maybe his successor in the storyline from someone who blindly follows orders to becoming more like his Father each day in his own way. A path that is more about being something better than what the old Charr was and most likely atone for helping Bangar get so far into his plans that it resulted in the death of half of Ryland's warband and some of them corrupted into Jormag's minions.
Ryland choice for the one being killed is more towards realizing too late what he has done. I suspect Bangar may corrupt Ryland into a Charr Icebrood for him to become One Charr but he struggles to keep his will under the One Charr mindset placed on the Charr corrupted by Jormag and Bangar's One Will. Thus Rytlock is forced to kill his own son to save him through death and set him free from Jormag and Bangar's One Will.
As for the Guarantee Death character....
Bangar is guarantee dead no matter what since he is blinded by his Xenophobic beliefs, wanting the Charr Race to become conquerors, and has already planned to take his conquest far into Cantha region as learned in the book collection from Vision of the Past update. I suspect his One Charr ideal is going to involve him using Jormag to "unit" the Charr as One Will thus all Charr, in his eyes, will finally be One Charr under One Will and One Mindset thus the Corrupted Charr will not only be single minded but they will act, talk, and even think just like Bangar. Thus all Charr will be One Charr, One Will, One Mind.... One Bangar.