@IncomparablyPerfect oh my gosh, I just noticed that you replied to me here (I also received and replied to your message but your comment reply here has some different feedback). Yeah, I see how Matt and Lenox could appear a little two-dimension at the start of the story—possibly even Dom and Fen, at least at first!
Your suggestions for Matt are very helpful, thank you! :) I really like how you analyzed each of the characters, but I think for Lenox, at least, it'd be really hard to show her true colors. Mayuri always perceived her as being shallow and silly, and when we as the readers see Lenox change after all the awful things that have happened, that's something Mayuri doesn't get to see because she's not there. I kind of thought of it like this: Chapters 1-26 are mostly all about Mayuri, because Reed's claims of her life being in danger only affected her. The other characters knew nothing about this and were unaffected until the last couple of chapters when they were held hostage and FORCED to be involved. So the epilogue serves to show how they grew from that point on, which Mayuri could never know. Does that make sense? I feel like that all sounded kind of confusing! haha