I think if not for the disaster in her first year and isolation in second, Nico would be this sort of person all the time. Supportive, motherly, but still into the whole "I'm the cutest" thing. From what we see of her with her siblings and in the times when her façade breaks, that's really her true self.
@Ghost Shogun I only play GBF but I know that Orchis and many people in GBF come from RoB. The background stories are different, though. Orchis in GBF is not the same person in RoB, so as the others.