And here you have her bio and also my headcanons about how Conner Cooper and she met each other and fell in love:
Full name: Rosemarie Fontaine/ Cooper.
Specie: cat.
Occupation: lawyer (and temporary masked vigilante and ally of the Original Cooper Gang)
Nicknames: Marie, Rose, Rosy, milady (by Conner), and “Rose Blanche” (her nickname as masked vigilante)
Marie was born in Fontainebleau, Paris, France. Her parents died in a voyage because the ship was sunk by Raleigh and his crew of pirates and all their jewels and money were stolen. However, the police never found enough proofs and Raleigh's lawyer got a watertight alibi for him, so he didn't go to jail and the police just closed the case.
Marie was a kid, so she was raised by her grandparents, and was pretty close to her grandmother: Giselle Fontaine, a rich aritocat and ex member of Interpol. After Marie finds out what happened with Catherine's family (her best friend at highschool), she spent her teenage years finding proofs about Raleigh's crimes and Muggshot's, and she decided that she would become in lawyer some day.
Marie met Conner Cooper in the 70s, in a formal party previous of an auction. Marie had heard that Sir Raleigh was the one who organized the auction and she thought that probably everything that was going to be auctioned were stolen treassures, and it turned out to be true, because the necklace with a sapphire that belonged to her mother was there.
That night, Conner came to the party too, he was planning to steal all Raleigh's stolen treassures, he was in disguise and danced with Marie just for the fun of "conquer a heart of another naive aristocratic pretty girl", but Marie realized who really was him since the beginning. She teased him while both were dancing: "if you're a Master Thief so efficient as I've heard outhere and it's true that you only steal to criminals, then prove it to me, Cooper. Unless those were just a bunch of lies proclaimed by a kiddo with a big ego..." That mockery and her amused smirk were enough to convice him to make a deal.
Both worked together, she distracted the guests and showed the true identity of that villain to all of them, ending with Raleigh's good reputation in aristocracy while Conner was stealing his loot and defeating his guards. Unfortunately, Raleigh managed to scape, but Conner stole the necklace and returned it to Marie, as he promised, and Raleigh was chased by the police and had to remain hidden for the rest of his life.
Since that moment Conner usually visited her at night every weekend on her balcony, he told her stories about his adventures as master thief and they shared romantic dinners on the rooftops of Paris. But when both began to falling in love with each other, he got panic.
Conner broke up with her and left during two years. In that time, Marie's grandmother died but Marie carried on and became in lawyer. She fought for the triumph of justice in her country, sent horrible criminals to jail and defended innocent people and sometimes also to people guilty of minor charges.
However, there were criminals who managed dodging the Justice thanks to their influences or because of lack of evidence about their crimes, so Marie decided to became in "Rose Blanche", a masked vigilante, to spy and defeat criminals during the night while she still kept working as lawyer during the day.
She grew up and became a strong-willed woman and she thoght she wouldn't see Cooper never again, until one day...
The Cooper Gang find out there is a band of criminals who were stealing and murdering innocent people and whom cheat the police to made them believe that was the Cooper Gang who did it. Between those crimes, it was also murdered a victim who Marie defended in the past in a case, and she wants to get justice, so she finds The Cooper Gang and worked together to find the truth and gather enough evidences against the real criminals. Months later, they found out who was behind those crimes: Clockwerk.
During those months, Conner often flirted with Marie and tries to impress her, but they didn't come together because she disliked his attitude with his comrades (specially with "M" Moureau) and his reputation of womanizer.
On a mission, Clockwerk found Conner, he manages to scape but ends up seriously injured. When Marie taking care of his injuries, Conner reveals to her that the main reason why he left was because Clockwerk finished with all his family and he couldn't stand the idea of losing her too, and tells her that she should leave the case now she's not fully involved yet and that she deserves to live a happy and long life with a good man.
However, Marie decided to stay with him because she had already got a lot of enemies as lawyer and masked vigilante anyways, because she was determined to defeat Clockwerk and his band, but foremost because she loves Conner and she didn't want to leave him alone in his worst moment. She told him: "No matter what happens, we will always have each other, so we'll never be alone. Any of us have a family anymore, but we could be a family. So what you say? Will you marry me, mon amour?"
They got married in secret and when Sly Cooper was born (in 1984), Marie donated almost all her money to orphanages and charities, and Conner and her bought a farm in somewhere in USA. When their enemies were too many and their lives were put in a worse danger, they left their jobs and dedicated the rest of their lives to raise and protect their son. Despite their difficult lifestyle, both were very happy in those years, Marie never lost her joy and Sly learned from her to always keep his positivity up even in the worst moments, to be loyal and to cherish his family and friends.
On est bien peu de choses
Et mon amie la rose me l'a dit ce matin
A l'aurore je suis née, baptisée de rosée
Je me suis épanouie heureuse et amoureuse
Au rayon du soleil
