Cecil

Talents like a "keen sense of smell" is undoubtedly a double-edged sword. As Cecil's sense of smell is seriously overly sensitive, there are some cooking ingredients whose smell she can't tolerate at all, and those imperceptible body scents caused by diet changes will also be intensified for her. One thing she really dislikes is getting people's awful scent on her, so she tends to have several tricks up her sleeve to prevent that.
In contrast to most people who judge by sight, Cecil is more used to determining her first impression of people via smell. With this standard, gender or appearance no longer matters that much to her. The effect of this 'primitive sensory stimulation brought by a sensitive sense of smell' has made the sagacious Cecil extremely devoted to her instinct. Whenever she "smells" someone interesting, she'll actively approach and befriend them, which mostly works out in her favor in view of her amiable good looks.
So far, her only setback is probably when she heard that a fellow Night Chains employee Mr. Sagi had welcomed a newcomer named Wensheng, who also categorized people by scent, she confidently went to ask him if he'd like to join her project, only to be turned down. Wensheng's response was, "You reek of medicine," but Cecil was positive she didn't smell like that. Regardless, with her dedication toward the research of smell, this tiny setback isn't even worth mentioning.

Cecil's research has already entered the experimental phase. She has tried incorporating all sorts of scent sprays into combat situations and has also started consulting on fragrances used in establishments under Night Chains. In one of her reports, she proved a theoretical perspective with loads of arguments: Smell can affect people's impression of a place and mood... This report quickly became a decision-making reference for various major businesses.
Statistics show that every Bonfire City's residents have different preferences for fragrances. Frostville City's residents like the smell of warm stoves and stews, while Cape City's residents are inclined to the smell of coastal plants. So long as one makes use of these scents, one will be able to rapidly create ambiences that better suit one's target groups, which will naturally increase the time customers linger around and consequently boost one's product sales. As business revenues were the first to substantiate Cecil's theory, her salary has been raised multifold.
Cecil makes sure every type of perfume or spray goes through the experimental process in order to produce satisfactory products. In her opinion, the most perfect tester is none other than her friend Nabi. That Executor who always desires nothing and has a fainter scent than a NC Ninja never fails to comply with Cecil's research criteria and provide ideal feedback. In a sense, Nabi may have had a part to play in Cecil's success.

Cecil's lifestyle is exceptionally simple. She basically only spends time in the laboratory and her home day in and day out. If there aren't any outdoor missions or a need to purchase anything, she will never complicate her life, for going somewhere new means coming into contact with impure smells, and she is of the belief she has to ensure "her senses remain pure." It is also the reason why she dislikes pungent food and unhygienic people, but it's a double-edged sword; if she doesn't experience enough scent samples, she will lose touch with the world too.
This problem has troubled Cecil for a long time, and it was only recently that she seemed to have found a solution. On The Eternal, she occupied a small area and ensured it was relatively clean and odorless before waiting aside for the crew and passengers to pass by... If a foreign or interesting smell were to waft up her nostrils, she would seek out the source and dive into an interrogation.
Since there were people from all walks of life on the train, such a method did facilitate Cecil's scent sample collection. Still, from time to time, some special people will also pass by, such as those who lack a scent, those who have particularly bizarre scents, and those who smell sweet but are inexplicably unpleasant.
Whenever Cecil expresses obvious aversion toward someone's scent, the Conductor is obliged to step in right away lest an armed conflict erupts on the train.