Nana was born in Ecruteak city in the Johto region. She was an only child. Growing up, the girl was very frail and sickly and she spent most of her early childhood going from doctor to doctor but no one could figure out what was wrong with her. Because of her condition, she was mostly isolated from other children and couldn't enroll to the Pokemon Trainer School upon reaching the proper age either.
One day when she was around nine years old, Nana's family recieved a visit from the girl's uncle who worked as a Pokemon Breeder at a Daycare in the Unova Region. Feeling sad about his niece's isolation, following talks with his sister and his brother in law, he decided to gift the little girl a Pokemon Egg. After weeks of caring for and nurturing the egg, it finally hatched into a Happiny. Nana was so happy about her new Pokemon that the two have been inseparable since.
As months went by, Nana and her Happiny grew closer to one another and, without any explanation and completely out of the blue, the girl's condition started improving leaving both her family and her doctors baffled. A year and a half after her first Pokemon hatched, Nana was finally allowed to enroll to the Pokemon Trainer School. Having been isolated from other children for so long, however, took a toll on her social skills and she could never really fit in so she kept to herself most of the time.
When she was twelve years old, Nana decided she wanted to go on an adventure and see the world. Her parents were against it, however, still being worried about their daughter. After weeks of pleading with them, the two finally agreed to at least let the girl travel to Unova where she could live with her grandparents for a while, on the condition that she proved she could look after herself by capturing a Pokemon. Determined to prove herself, the girl spent every afternoon for two whole weeks on the outskirts of the city, looking for a Pokemon that she would like to own. After a long, exhausting search, she finally spotted the one. The Sun had begun to set and she was on her way back home, disappointed in another failed "expedition" when she spotted a Chikorita napping under a tree. "This is the one!" she thought to herself as she looked down towards her Happiny which she never kept in its Pokeball. The battle was easier than Nana expected since the Chikorita never saw the Sweet Kiss- Pound combo coming. Days after her succesful capture, the girl was on her way to Unova.
Nana spent six years in the Unova region where, inspired by her grandmother's past as a Pokemon Nurse and driven by her desire to help other people who might ever find themselves in a position similar to that of her own as a child, she diligently trained towards becoming a medic and a pokemon nurse. Some time in those six years, her Happiny had evolved into a Chansey, her Chikorita became a healthy, beautiful Bayleef and she had acquired a Crobat that had taken a liking of her back when it was a Zubat, when the young woman nursed it back to health.
At the age of eighteen, the young woman was allowed to become an intern at a clinic and also became an apprentice pokemon nurse at the local Pokemon Center. During her work, she had the honour of meeting Professor Juniper whom she aided with the treatment of a flock of Ducklett. As a reward for Nana's hard work, the professor gave the woman a Snorunt which she later evolved into a Froslass during a visit in Icirrus City. Whilst returning to Striaton City where her grandparents lived and she was doing her work as an intern and a pokemon nurse, Nana had to make a stop in Castelia City to deliver medicine to a young girl who was visiting all the way from the Kalos Region. Along the way, the woman had captured an Emolga that managed to get itself in trouble with a band of Scraggy and Scrafty, seemingly over territory. Upon delivering the medicine, Nana was offered a trade for her newly captured Emolga. The little girl was so hung up on the Sky Squirrel Pokemon that the woman had no chance but agree with the trade, thus obtaining a Dedenne.
Whilst in Castelia City, Nana heard of a young, promising researcher by the name of Charleston. Having heard Professor Juniper mention that name time and time again during their joint effort to save the Ducklett, the woman was suddenly intrigued in this so-called prodigy so she decided to ask for a transfer to Castelia. She then spent the next two years obtaining her practice license as a medic and becoming a certified pokemon nurse. The name Charleston kept popping up wherever she went, making the girl more and more intrigued in the still mysterious character.
During her studies, Nana learned of the existence of a special flower that could possibly create one of the most powerful and effective medicine known to man, so effective, in fact, that it could work on both humans and pokemon which would make it a never seen before miracle medicine. The location of this mysterious plant was said to be Crimson Island so, when Nana caught wind of the mysterious researcher Charleston organizing an expedition to the very location, she immediately signed up for it. Shortly after signing up for the trip, as she was readying herself, Nana stumbled upon a mischievous, purple Wynaut that followed her around for days, causing enough trouble and grief to get even the woman's patient Blissey slightly annoyed. Eventually, she had to capture it, making it the newest addition to her team.
Due to her sheltered upbringing resulted from her illness as a child, Nana grew up to be quite socially awkward. She'll often have a hard time striking any kind of conversation with others, unless it's strictly for work. Once she warms up to a person, however, the woman can be quite cheerful and outgoing. The woman does not understand jokes or the concept of joking, the only thing that ever makes her laugh being her pokemon under certain circumstances. She can also be quite oblivious to social norms at times and is very prone to doing socially unacceptable things.
Nana is kind and caring towards any and all pokemon, no matter the size, shape, colour or how dangerous one might look. She is extremely dedicated to her work with pokemon and humans alike yet she finds it hard to be herself around people the same way she can be herself around pokemon.
Curious by nature, the woman could spend days, weeks and even months pursuing something or someone that managed to pique her interest. That would explain her being so eager to join up with Charelston and a bunch of other people going on the expedition.
Nana can be quite impulsive, especially when there's pokemon involved. She despises anyone that would even think about mistreating their pokemon or using them for evil deeds. She will often break social norms and go out of her way to aid a pokemon that she thinks is being mistreated or misused by their trainer.
At the time of the expedition, Nana's team consists of Blissey, Meganium which she found out is female, Froslass, a male Crobat, a male Dedenne and a male shiny Wynaut.