Marine is good at getting close to the girls and keeping them around, but no one seems to thrive by hanging around with her
I think she's always looking for someone she can let off steam with, which is just demotivating for others, but the girls gradually get dependant on her too cuz they also start to do the same like sharing complaints about the work cuz being a chuuba is that stressful
That's why girls around her like Rushia, Aqua, Shion, Kanata, Lamy, always become mentally unstable unlike people around like Subaru or Mio who like to bond with friends by motivating each other
Ao is not looking like she's going mentally ill for now, but she's not looking too motivated to expand her activities or relationships with other holomens either
Marine might be a good friend irl but definitely not a good option to be too close to if you want to succeed in holo