Kyle is a huge mystery throughout the first book, Normality Twisted. You do learn about him during that time but it isn’t until Mages of Vane that he really opens up. Or rather the situation does. The one thing you need to know about Kyle is that he lies, which he believes is necessary.
Kyle’s theme song is Prelude 12/21 by AFI. I knew this was his song the first time I heard it.
“We’re still here because of all the people in the universe she would see us suffer the most.” – Kyle Phoenix Element Mages of Vane, Chapter 8 (before edits)