Mamari is born in Ul’dah to Lord Lolorito Nanarito and his wife Numeme Nume as Manaru Naru. While taking after Numeme, who was plainsfolk, in terms of appearance, her name was that of a dunesfolk to show her connection to her father.Numeme was a successful businesswoman in her own right, heading a fleet of trading ships which operated in Limsa Lominsa. Indeed, their marriage served as a union of business as much as themselves, though both would profusely deny it was done for business alone.

Numeme is lost at sea in a storm while overseeing the budding trading route with Kugane when Mamari is three. This leaves Lolorito as the sole living parent of Mamari, though she is already accustomed to the various nannies and caretakers two busy and rich business owners would have.

Mamari expresses her first interests and talents in the art of conjury at the age of seven during a visit with a healer due to illness. Seeing the art being performed, her childish curiosity lead her to barrage the healer with questions and eventually request to try to use their cane in attempt to try the art herself. Hesitant to deny the daughter of Lolorito and seeing no harm in a supervised attempt, the healer yielded his cane to her for a moment and found her gifted with a naturally strong feel of the aether around her.This information was therefore passed onto her caretaker of the time who in turn passed it onto Lolorito. Feeling the role of a conjurer was an elegant art befitting of a young merchant princess, Lolorito chose to seek out a tutor in the skill for his daughter.

Mamari was successfully being taught the art of conjury by an Elezan named Rotert Ceadaux. Rotert is a native of Gridania who studied as a conjurer in the guild for many years, only leaving on the behest of teaching Mamari the art. Lolorito had his daughter brought under heavy protection to the conjurer guild to after failing to find a teacher more locally, but would not suffer her to stay there long term. It was after meeting the young Lalafellian himself that he agreed to the task; the money Lolorito offered swayed him little, but the eagerness of his perspective pupil won him over.

Rotert proved himself to be an excellent teacher, nurturing and honing Mamari’s natural skill at the art. Furthermore, he would not let Mamari sit idly on her abilities, as it was his belief that the healing art was best practiced on those who needed succor. Thus, as refugees poured into Ul’dah, he often took her to provide aid to those who were wounded or fell ill during the journey. Lolorito did not protest these trips, barring that Mamari was properly compensated for her time in some manner and proper guard accompanied them. Money was not commonly found among the refugees, but Mamari often traded legends from their homeland or small handmade trinkets in payment.One such trip, which was also their last for the coming reason, found them returning from Lost Hope. On the road, they found themselves waylaid by bandits. While they had suffered some encounters with vicious wildlife or a small group of bandits, of which their guard could drive off, this group was more organized and quickly overpowered them. Their goal was simple: Mamari’s capture for ransom. Though Rotert attempted to defend her, he too was knocked aside. In her fear as she was being taken, Mamari’s abilities welled and exploded into a bright white light which stunned the men around her. This gave Rotert and the guard time to recover, distract the bandits, and to usher Mamari to the relative safety of Black Brush Station.

Rotert was faced with a conundrum; Mamari had tapped into abilities he knew from his time at the conjurer’s guild to be forbidden. Pleading with Lolorito, knowing the danger of these powers, he was given leave to return to Gridania with her and remain for some time. With little choice considering what had already transpired, the guild agreed there was nothing else to be done but to see her taught to control this and any other ability which might manifest though refusing to actively teach her any further abilities.

While Mamari made multiple visits to Ul’dah, she spent three years calling Girdania home. No new powers awoke in that time, and she became master to a spell which was known as Holy, the selfsame spell she had used when under threat of capture. Now fourteen, it was only a scarce few months after her return to Ul’dah that Rotert fell ill. The illness was rare and while there was a cure, it was terribly expensive. With no other choice, Mamari pleaded to her father to assist, pleas that were turned down. While Lolorito cared for his daughter, he would not break his principales; a man lives or dies on his own back. He didn’t give handouts, particularly not notably expensive ones. At least, this was his claim.With the only means for a cure out of reach, Rotert soon passed leaving Mamari grief striken at the loss of her dear mentor and friend. She withdrew, losing the naturally upbeat nature that was a cornerstone of her personality throughout her childhood. But her depression soon turned to rage at her father’s perceived callousness. This anger festered for some time before Mamari made the choice to leave, running from her existence as a merchant princess and into the much harsher streets.

At fifteen, Mamari is adjusting to life outside of her pampered past. While a choice made in anger, her experience in the refugee camps served a great deal in educating her for the task ahead. Having taken a notable amount of gil from her household when departing, around 15,000, her first order of business was to change her appearance in some fashion. She makes her way to the alchemist guild, paying for the dye necessary to change her hair color. While a messy first attempt, she succeeds, her hair turning from blonde to a brilliant sapphire blue shade. She leaves behind her name, Manaru Naru, and takes the name Mamari Mari. For his part, Lolorito felt no ill will toward his daughter for her actions, instead allowing her to make her own way if it was her wish. Even the money she had taken was but a small drop to him.Recalling the value of trinkets and baubles such as rings and necklaces, Mamari choses to take up the practice of goldsmithing. While clumsily working through her early days to craft worthwhile pieces, her skills improved slowly as the coffers she took begin to run dry. Working within the guild as a goldsmithy, she manages to begin to turn a profit with her work. She also continues to ply her trade as a conjurer, discarding her father’s rule of compensation and often helping in the refugee came right outside of Ul’dah for no charge though her experiences being waylade on the road kept her from visiting camps further out. Eventually, at the suggestion of one of the refugees, she makes her way to the adventurer’s guild and finds a second source of income healing for various groups seeking their own fortune and fame.

Mamari witnesses the invasion of Ul’dah and all the horrors that accompany it. With her skills as a healer, she takes to the streets, desperately trying to save all she can. Many she tries to help don’t survive, and Mamari is eventually nearly killed herself by one of the various monstrosities in the streets and forced to retreat into hiding to succor her own wounds. The events of those days never fully depart from her, leaving permanent psychological and physical scars.

With the various scars of the calamity and the lingering grief of her lost mentor, Mamari fritters five years away spending what gil she doesn’t need for room or food on drinking. Having first found the vice during errands to the mining guild for ore needed to work as a goldsmith, she’s now a regular at the Quicksand. In this time, she’s also become adept in battle due to her work in the adventurer's guild. She rarely visits the refugee camps now, finding little time for it between her own jobs and her liquor habit.Said liquor habit brought her into first contact with Sia Reeve. A known troublemaker, she and Mamari quickly found a mutual fondness for each other’s company. It wasn’t, however, until Sia landed herself in some legal trouble with the Brass Blades that their friendship became more than that of drinking pals. Mamari ponyed up the necessary funds to spring Sia from incarceration and helped her have the charges dismissed besides. When Sia asked how she could repay her, Mamari simply stated that she could do so by staying out of further trouble.

Seeing the girl had no real income outside of what she could make in the Bloodsands and whatever illicit activities she might get up to, Mamari offered to show her the ropes in the adventurer’s guild. Taking up a levequest together, the two found themselves well synced in battle. Quickly realizing this and after a few additional levequests, Mamari suggested they make their partnership a long term one. Sia happily agreed.

Mamari begins to experience headaches and visions, something Sia had been experiencing for some time. Noting the growing reputation of the pair and seeing one such attack within the Quicksands while they were on break, Thancred saw fit to approach them. Explaining the gift they had was known as the echo, he invited them to the Scion’s base of operations in the Waking Sands. This interaction would only cause their reputation to further skyrocket after they jointly dispatched Ifrit.After some debate once the offer to join all three Grand Companies came, it was decided between the two that joining the Ul’dah Grand Company would provide perks they couldn’t otherwise gain and would be near hat-hanging distance besides. Sensing Sia’s reluctantness to deal with the law in any capacity, Mamari took it upon herself to do most of the hands on work with this arrangement, requiring Sia to come only when absolutely necessary. Mamari saw them both supplied with Chocobo mounts to make journeying across the land when teleportation was not available faster. Allowed to free roam the land when not in service, these Chocobos will often join them round a campfire at night with their fondness for each of their mistresses clear.

Things remained much the same until the return to the Waking Sands after Titan’s defeat where they stepped into the aftermath of a massacre. The information gleaned from echo visions were enough to make Mamari queasy, throwing her back to the terrifying days of the Calamity 5 years prior. Seeing the distress, Sia helped her friend out of the building and they made their way to the Church of Saint Adama Landama. There, they arrange transportation for their comrade’s bodies. Despite her earlier issues, Mamari elects to go with the group despite Sia's offer to deal with this without her. The callous behavior of some of the workers irks Mamari and they wind up in a verbal altercation. Despite this, their comrade’s bodies are successfully seen to the church for their final rites.Once seeing the departed to their final rest, and helping Cid recover his memories, Mamari struck up a quick friendship with the engineer. While in very different fields, they find the knowledge each can provide the other a boon. Her other new companion, Alphinaud, is found to be less tolerable. At this point, his actions and somewhat pompous behavior reminds her of her father a bit more than she would like. However, she rationalizes this being due to his age and inexperience. While never voiced, she quickly begins to hope that he’ll find his footing to not need such an overinflated ego. With this in mind, and her now expertly honed skills as a healer, she and Alphinaud remain civil but typically only converse concerning their shared art of succor.