Amanita can be a fierce jailer but trust is a complex thing in this story.
The mask. That's a good point. A very difficult point in their story hahahaha Maskeguy can be cute, in their own bizarre way, but still cute... We hope we can tell more about their story soon.
The characters with more implication with their own zodiac signs are: Akane, Maskeguy, Pin and Ariel. This isn't by chance, you have good eye. Anyway, Akane and Zihel have some similarities. They're fighters, they hate to be prisioners and they're too linked with the fire elements.
We're working in the angels' chapter, so very soon we'll have new answers and questions for you.