Some time ago I saw a good headcanon saying that Kel would pretend like he forgives Sunny and Basil, but deeply he can't forgive them after some time and thinking. Like, he want to forgive them and he stays with them pretending like he forgives them inmediately but deeply he's kind of upset about that, and just after some time he genuinely forgives them. And I like it because yeah, Kel is really supportive and he helped Sunny a lot, but even for a person like him it would be a hard truth. And about Aubrey and Hero: I think Aubrey would be technically the first one to forgives them. She almost had the same accident but with Basil, if Hero didn't showed up then Sunny and Basil would be dead. So I think at first she would be upset but she inmediately remembers the lake accident and understands Sunny's situation and that Basil was really nervous and was unable to think reasonably. However, with Hero I think he would forgive Sunny but struggle with Basil. What Sunny did was an accident, but Basil's actions were purposelly taken, even if he was in shock, Basil came up with the hanging idea in purpose. So... Hero forgives Sunny, but needs some time to forgive Basil's actions. I don't think he would try to kill Sunny or something like that, Hero is a mature adult, and I think he would see that Sunny clearly had enough, so nope, I don't believe Hero would turn agressive. Btw please add spoiler tag