Rena was only just born in Marineford when her father, Rosinante, was sent on a mission to track and stop Doflamingo. She doesn't remember much of him... gifts sent on birthdays, a voice on a transponder snail... and the hole his murder left in their family. After his death, Rena was made to take her mother's name and join the marines; All an effort to keep their connection to the Donquixote bloodline hidden from Doflamingo, lest he decide to do something about it. Now going by the name Vulpes Rena, she trained under her adoptive grandfather Sengoku. At some point, she was gifted the rediscovered Calm Calm fruit, inheriting her late father's powers. However, much to her frustration, neither her mother nor grandfather would divulge much information on Rosinante or his passing to her- aside that it was the fault of the notorious pirate Doflamingo. What she did manage to uncover, though, was her father through away his mission to help a young, sick boy. If she could just find that boy...
Marineford:
As a marine, Rena was expected to stay behind to defend Marineford and ensure Ace's execution was carried to completion.... despite her feelings on the matter. Trafalgar Law's sudden appearance near the battles end intrigued her, recognizing the name from some stories of her father's before his passing. Determined to find him, she approached Shanks before his departure and petitioned him to take her as far as the next island in return for working on his ship and all the berries in her possession. Always willing to see just what this new generation of pirates is capable of, Shanks agreed to help her escape her Marine duties... and thus her journey as a pirate began.
Rena spent some time on her own, a missing poster appearing soon after her departure. She had to dodge hunters seeking the reward money and pirates seeking revenge for the marines' actions both. Eventually, her and the Heart Pirate's paths crossed. She pled her case to Law, and as a last resort to gain his favor used her devil fruit power to allow them to speak privately and mentioned her relation to Rosinante. Her connection to his old benefactor proved enough to Law to allow her into the Heart Pirates, given she could pull her own weight.
Punk Hazard
Knowing Law meant to go confront Doflamingo, Rena followed him in secret. It took much to stay hidden while on Punk Hazard, between the weather, the beasts, and Cesar's eventual mass gas attack. She hid on the Strawhat's ship to avoid certain death... and only revealed herself once Law and the Strawhat crew were out to sea, much to Law's chagrin.
Dresserosa
Rena demanded that Law allow her to take part in the takedown of Doflamingo, and who was he to refuse? Rosinante was taken from her, too. She accompanied Law to the hand off, and when things went south on Greenbit, briefly posed as Law to distract Doflamingo. While she managed to shoot him, she was nowhere near strong enough to press the attack, and was easily defeated, dragged back to the castle with Law as a prisoner.
Broken out by the strawhats, Rena would be ordered to stay with Zoro's group as Law and Luffy went to track down the key to Law's cuffs and press the attack on Doflamingo. During that time, she thought Law had been killed by Doflamingo, and had to be talked down by the others from going to attack the notorious pirate herself. She eventually aided the others in stalling the advance of the birdcage before being reunited with her captain.
After Doflamingo's defeat, Rena joined Law in talking to Sengoku. It provided much needed closure for both of them, and shortly after her Missing poser was changed to a more updated Wanted poster, which her mother now keeps posted on her wall.
Zou:
Rena accompanies Law and the Strawhats as they return to their crew on Zou. They are given a warm welcome by all but Taiga, who is mad at Law for going on a suicide mission, and Rena for disobeying orders. They are both quickly forgiven, however, since the anger is borne only for love of her crewmates. Rena joins the Ninja-Pirate-Mink-Samurai alliance with the rest of the Heart Pirates.
Wano
Rena spent the early parts of the liberation of Wano utilizing her calm-calm fruits ability to spy on the pirates Basil Hawkins and X Drake. However, some time during her spying, she lost communication with her crew. She stumbled upon the wounded Kamazo the Manslayer and treated his wounds. They were eventually found by Eustass Captain Kid, and thereafter arrested and brought to the Udon Prison Camp. Rena stayed with the Kid Pirates through the Onigashima raid, reporting their position and status to Law as she went.
