I had been waiting to play this and finally caved. Mayhew was a lot of fun for me to interact with personally. He embodies the phrase "there is no good or evil, only perspective and opinion". None of the characters do things for no reason (i.e. we're going to do this just to have a plot point). There's always a motivation behind it and it shows the thought you've put into their backgrounds. I wouldn't be surprised if you told me you have little stories or outlines written up somewhere to flesh out the characters while you're writing. I'm definitely looking forward to the end of the story and will probably end up with multiple playthroughs to try every path.
Your use of font shifting, such as italics, to provide emphasis during dialogue is a nice touch. It's a very overlooked, easily employed, tactic that a lot of VNs don't use and it really does make a huge difference.
Spoiler: I did cotton on to Santino pretty early (I recognized his arm). The look on my face was probably hilarious. I laughed in shock and I'm pretty sure the words out of my mouth were "oh shit!" Lol