I have a feeling there are some unlisted traits for the PSO2 races that might give extra abilities.
[Possible Spoilers]
From what I picked up on while running the story lines is that the CAST seem to have higher endurance (Maria and SAGA out pacing others with training), and they seem to sense high energy sources (Risa and Maria seemingly able to detect Alma), I wonder what other hidden traits might be related to the CAST, since I'm running one as my main character.
Newmans and Deumans might also have some extra traits but so far I haven't seen that come up in the story mode yet.