“The Magic Kingdom” is going to be all about time war from the time warriors’ perspective. It’s Summer, Jordan, Nassir Amari, Ghost Girl, and Ghostheart vs. Doctor Infinity. Hopefully how I handle it will give you some ideas.
I’ll always defer to Dave here, but Jason’s Phase Two story right now uses the “science adventurer” angle as the way he gets things done, with “nanites” being more the MacGuffin and story driver than the source of his moment-to-moment powers.
I don’t know how much you want to incorporate things like Jenny’s Poppet system, where there’s other spinoffs of Jason’s nanotech that do more specialized things, but I’m writing those in as options.