You've taken these characters and personalities and written them in such a fantastic way where it isn't "overly done" or forced, in so many fanfics have I seen characters having those typical ways and them being drastically overdone to the point of flanderization. But, you do a good job of being very good and nicely vague at times with the characters personalities that leave me wanting to see more of them. Zeph, Boreas, Lucius, and Toxica are just some of my favorites.
Your characterization with Diego is very commendable because no one is truly evil, and by making Diego show more of a softer side you've shown the humanity in his character which makes me care for him since he isn't just the straight up jerk ass with no redeeming qualities. You've given a bit of light to his character in the same aspect N in the games isn't a evil human being.
Even the part about Drayden words, "As the city's mayor, I've given everything to development. But the newest things are not always the best." I really really liked this line, because it truly symbolizes and gives enriching characterization to Drayden. Plus it's a cool line also :P