Horror Mode Predictions:
Blake (Mr. Black Hat) is not the villain. Either Gwen would be the villain or it would be a hijack.
Simon survives for once.
Sky was sick when Horror Mode occurred, so he wouldn't be aware of what happened just yet, as he wouldn't be present in the audience. He would be replaced by a creepy-looking stuffed animal with a music box inside.
Chloe (Vineria) either dies or manages to escape. Imo it's most likely the former.
Mard is the only bonus character to survive.
That's all, folks!