Blue is almost always seen wearing scrubs with flowers on them. However, when she's not on shift you can find her wearing sleeveless hoodies and baggy jeans.
Blue has a gentle personality. She treats her patients with the utmost respect, and makes sure they're always happy. Despite this, there may be times where she breaks down due to stress, but she bounces back quickly.
W. D. Gaster
Gaster and Blue are close friends. He confides in her when having a rough day, and will rant about the patients he feels aren't up to the standards that they should be. Upon hearing this information, Blue will change their daily schedules to accommodate the improvements Gaster wants.
Blue knows Asgore fairly well, but they don't talk often. She gets most of her information about him from his son, Asriel.
Early on, Blue was genuinely scared of Lucario. His obsessiveness over her made her feel uncomfortable, so she kept her distance and always spoke to him with sarcasm. This continued for quite some time, and it had even become a running joke in UMH that Lucario's 'Senpai' would never notice him.
However, as time went on, Blue saw how determined Luca was, and gave in to his feelings, thus giving him a chance. Once they had gotten together, Blue kept an eye on him constantly to make sure he was alright. She even took him on walks through UMH without his straight jacket on.