Constantly thinking selflessly - in her own way of combating every becoming like Lucifer in her eyes - about Heaven and its people, Sera makes every issue her problem to deal with by choice. She isn't particularly enthusiastic about it, but that's only because of her calm, cunningly cold demeanour that formed due to being in such a work-heavy environment for so long. In all honesty, despite being in Heaven, Sera hadn't known of relaxation for herself. All in all, she's just a very stressed Angel