Just a theory, but looking at Redeye and Vasilli, I believe she’ll be mostly a sniper.
While Vasilli’s default MoA is the middle ground between the Felix and the PDP
These consisting as alternatives giving higher risk and reward or lower risks and rewards.
The Felix being more a powerful but slower firing, lower ammo capacity rifle.
(That is originally, Not even going to try to bring up how it’s generally just crap compared to the Moa except for 4 more damage and that the higher ammo capacity doesn’t help.)
He also has the PDP which is more forgiving and allows repeated firing since it’s semiautomatic.
Redeye has the Grandiur which serves as a powerful Mid-long to Long range rifle, which serves as a middle ground between the two alternatives he has in his loadouts, Aimee’s Default PDP and Arty’s Default Dreiss.
The Dreiss is much better for closer range fighting than the Grandiur, serving as an all around Mid-Long Range weapon and is more forgiving, while the PDP gives Redeye a bit of a sniper alternative, but not a pure high damage sniper.
Looking at these two I believe Aimee, besides her default PDP will gain access to Redeye’s default Grandiur and Vasilli’s Default Moa, giving her a more pure high damage long range sniper role and mid-long range marksman role along with her default being the middle ground.