Glowing Eyes/Technicolor Eyes: After Hatake somehow cures her from infection, her eyes become the same luminescent silver color as his, implying that this unnatural eye color is a side effect of the cure. Hatake provides her with contacts of her original eye color with which to mask them in the following episode after Julia discovers that her new eyes have an extreme sensitivity to bright lights.
“Someone designed this virus and it sure as shit wasn't mother nature.”
Cruel and Unusual Death: Stabbed with a syringe by Balleseros thus giving her a embolism. It caused her to convulse violently then she has a shelf full of infected rats pushed on her which eat her ALIVE. Not an easy way to go, to say the least.
Karmic Death: Daniel stabs him in the chest with an ice pick; the wound itself is not instantly fatal, so he proceeds to remove the Major's protective clothing, leaving him to be killed by the elements; similar to how Balleseros himself disabled Doreen and left her to be eaten by the rats.
Even Evil Has Standards: As mentioned above, he is visibly disturbed upon witnessing Hatake's murder of three infected scientists after they had surrendered. It is this event that prompts him to start to question whether his Undying Loyalty to Hatake is well placed.
Genre Savvy: After Balleseros ambushes him out in the snow, he survives due to the heavy protective clothing he was wearing. When he returns the favor and takes out Balleseros, he makes sure to remove the Major's layers so that he won't be so lucky.
Heroic Sacrifice: He triggers the explosive collar himself, fully knowing that it will result in his own death, in order to spare Hatake from having to make the Sadistic Choice of who to save between him and Julia.
Conspiracy Theorist: She's suspected that something nefarious has been going on at Arctic Biosystems for a long time, and has a low-key Room Full of Crazy tying them to the cases of missing children - among them her own brother, Miksa - going back decades.
Separated at Birth: Technically, they were separated as very young children, but "Daniel Aerov" is actually his long-lost twin brother Miksa.
Played by: Anders Yates
Driven to Suicide: The first thing he does when he's freed from his restraints is take a power tool to his jugular vein.
Fate Worse than Death: Hatake chained him up in an abandoned outpost in the middle of the Artic. He's an Immortal, so he can't die from starvation or exposure. So he just sat there, for God knows how long, slowly going mad.