The Quartet
The main characters of the story! They all have groups they're part of, but they're important enough to have their own group - they're the POV characters, after all!
The upbeat time machine who wants to figure out his past.
A talented Aresian engineer who will never let themselves fail.
A passionate astroneer aiming to quench her planetary vengeance.
A helpful but snarky AI trying to find her true self in the process.