The characters' thoughts and feelings after Allison's death written in third person; mention of Aiden's death from Lydia's and Derek's thoughts
Note: These are simply what I think are the thought processes of each of the characters. I in no way believe there is truth to some of their thoughts, such as blame or fault being put upon characters.
Isaac: He felt pain…emotional pain. He had been there as she died…as she uttered her last words. Allison saved him. She saved him from getting killed. He felt somewhat…guilty. She has her dad… she has Scott, who now have to deal with their loss. Who'd be grieving for him if he was the one to go? Allison left an imprint on everyone's lives.
Stiles: He'd lost a friend. He felt sick. Allison had died because of him…because of the nogitsune: The nogitsune that'd been taking over his body. Too many people were dying and another life couldn't have been lost at the expense of him…but it was. He felt terrible every time he looked at Scott; his best friend was clearly broken because of this. He tried to be there for Scott, but he couldn't help but think that this happened because of him.
Lydia: She lost a true friend…a best friend. She knew if they'd come to find her, someone would die…Allison would die…and she tried to warn her not to come. She felt it…she felt her best friend die. She felt a void in her heart. She cried daily…and when Aiden died she broke…two people she cared about deeply were dead...and she couldn't lose another person she cared about. Stiles was her support system through this; he'd comforted her and had been her shoulder to cry on. Allison and Aiden both had done the impossible: they defeated the oni and were heroes.
Derek: He saw it. He saw the beta twin die…he saw as his brother broke down. They wanted to be a part of Scott's pack, but Aiden never got to prove he was a good guy to him…or even Lydia; he had proved in that moment—the moment he'd defeated the oni—that he was in fact, a good guy, Aiden wanted to run and hide, but he fought to save lives and in the end his life was taken.
Argent: He's lost a daughter…his only daughter…only child. The women were the leaders in his family. He had been helping her make her own arrow and she'd told him she loved him for the last time; she might have known she could potentially die. After his wife's death, he didn't think he could take another hit like this…but he had to be strong.
Kira: She didn't know her very well…but cried as she saw her die in Scott's arms. She saw the distress that the others were in…and the impact Allison left on their lives, especially Scott's. He was so broken over her death. She wanted to help him…she wanted to help them all. But what could she do? What could she say?
Scott: He missed her…every day he missed her. She died in his arms…and he broke; the tears came out and he sobbed. He wanted to protect her. He wanted to save her. Why couldn't he save her? He loved her…he still loved her. He never wanted her to get hurt. All he ever did was try to keep her safe. Allison would always be engraved in his mind…in his heart. His memories of her would never escape his brain. Allison Argent—his first love, the one he'd always love—would always hold a special place in his heart…and nothing could ever change that.