These are my ideas for the personality types of the key characters, although I'm not completely sure about the Unit 919 characters..
Morrigan: she seems to be an introverted character who makes decisions largely based on her feelings and loyalty to friends.. because of that, I would say IXFX.. leaning towards INFP.
Other main characters:
Jupiter: ENFJ- I think he seems to be an extroverted, intuitive/imaginative character, who makes decisions based on feelings or others.. he definitely has some traits of an ENFP, but I would say he's an ENFJ because of the extent of the planning he shows with his responsibilities and the sense of inflexibility he has with some things.
Hawthorne: ENFP (extroverted, intuitive, feeling, prospecting)
Cadence: ISTP (introverted, observing, thinking, prospecting)
Jack: ISTJ (introverted, observing, thinking, judging)
Other Unit 919 characters- these ones are a bit harder to figure out since they haven't been focused on quite as much, but here are my ideas :)