Fang and Vanille *spoiler*
Hope ended up looking up to Lightning, and Lightning most likely saw some of If Hope thought "that way" about anyone it would be Vanille. Fang is always looking out for vanille, not unlike lightning is with serah She learned that he wasn't such a bad guy and at the end was able to. I believe Hope has feeling about Vanille because in the end, when I haven't played the last FFXIII installment but the only relationship to.
After the party splits up following Anima's defeat, Sazh goes with Vanille as he tells her about his son. Unable to kill Vanille, Sazh unsuccessfully attempts suicide. Sazh and Vanille are then captured by Nabaat. Before Lightning's party rescues Sazh and Vanille, he reconciles with her for her role in Dajh's fate. After these events, Sazh leaves to help the civilians of Cocoon,  then decides to move onto Gran Pulse.
It was a love story after all :: FINAL FANTASY XIII General Discussions
Reuniting with Dajh and deciding to fight no matter what the future holds, they go through a time gate and help Serah and Noel in their battle against Caius. In Lightning Returns, Sazh has set up his home in the Wildlands. After Dajh's soul is lost and his body falls into a coma, Sazh becomes tormented by his seeming failure to protect his son.
In the May edition of Official PlayStation MagazineYoshinori Kitase said that Sazh was intended to be an Eddie Murphy -style comic-relief character as well as a sympathetic character. Due to the character having the largest amount of dialogue in the game, an experienced voice actor was chosen for him.
He was also named "Baz". The two wake from crystal stasis within the Pulse Vestige containing the fal'Cie Anima thirteen days prior to the start of Final Fantasy XIII, which in turn kicks off the chain of events that lead to Cocoon's descent into chaos. She eventually meets Snow and becomes his partner as part of Cid's plan to overthrow the Sanctum, later befriending Lightning. After rescuing Sazh and Vanille on board the Palamecia, she and Vanille reunite.
Oerba Yun Fang
Later, after being told about their focus and resolving to fulfill it even if she has to fight her friends, Fang has to fight and tame the Eidolon Bahamut. On Gran Pulse, despite Vanille's protests, Fang reveals that she was responsible for scarring Cocoon's shell centuries earlier and bringing deadly recriminations on the population of Gran Pulse.
Fang was originally scripted to be a male character during the early stages of Final Fantasy XIII's development, but early in the writing stage, was rewritten as a female character. Lightning gives Noel the task of finding Serah and bringing to her to Valhalla. Traveling to Serah's time, Noel sets out with her to find Lightning, repair the timeline and change his future at any cost, even erasing himself from existence.
Eventually, Noel gains respect for Snow. Though he and Serah finally defeat Caius in Valhalla, Noel is forced into a situation that ends with Caius's death. By the events of Lightning Returns, forced to protect the people as the "Shadow Hunter" after the Order of Salvation take over Luxerion, Noel becomes obsessed with a fabricated prophecy that if he kills Bhunivelze's savior, he will bring about a new world where he can live in peace with Yeul.
They briefly ally to rout an extremist sect of the Children of Etro, who have been killing women who resemble Lightning. Lightning provokes Noel into fully expressing his rage and engaging him in battle. After the battle, Noel destroys the oracle drive playing the fabricated prophecy, finally freeing himself from his guilt.
After Bhunivelze's defeat, Noel offers his life to give Yeul a chance to live in the new world, and Caius allows the final incarnation of Yeul to go with him.
When designing his clothes, Naora took into account he was a hunter, while his swords were based on a Final Fantasy III illustration by Yoshitaka Amano. Eventually, they meet up with the party before they enter Orphan's cradle.
This plan involved using the l'Cie-forged beast Ragnarok to destroy Cocoon with the countless deaths from the crash to cause Etro's Gate to manifest in the physical world.
He even goes so far as to use anti-Pulse propaganda to instil fear in the citizens of Cocoon. The first attempt, the War of Transgression, fails through the intervention of Etro. When confronted by the team in Orphan's Cradle, Dysley plays on their emotions with illusions of Serah and Dajh before being mortally wounded by the party as Barthandelus.
Now, don't you worry. I'll come and find you, no matter where you go. Fang and Vanille hail from the village of Oerba on Gran Pulse. Fang begrudged Oerba's patron fal'Cie, Animafor failing to protect the people of Gran Pulse, and agreed to the ceremony of being made Anima's l'Cie as a way to get close enough to confront it. Fang had an outburst in Anima's chamber and was going to be put to death for blasphemy by the Oerba priests. Vanille, who was next in line to be branded a l'Cie, shielded Fang and begged for her life to be spared, offering her own to complete their Focus together so that they would never be apart.
Together, Fang and Vanille gained the power to become the beast Ragnarok to fulfill their Focus of destroying Cocoon. Vanille feared the power bestowed upon them and Fang became Ragnarok alone to complete their Focus.
Oerba Dia Vanille
Fang's Ragnarok cracked Cocoon's shell and, taking pity on the people of Cocoon, the goddess Etro intervened and crystallized both Vanille and Fang before they could complete their Focus. Fang and Vanille's crystallized forms ended up in the Pulse VestigeAnima's resting place, and in the war's aftermath, Cocoon's fal'Cie raided Pulse for materials to fix the damage Cocoon had sustained, and the crystallized Fang and Vanille were brought into Cocoon.
Fang and Vanille's threat causes Kujata to brand Dajh a l'Cie. Hundreds of years later, Fang and Vanille awaken from crystal stasis. Fang awakens with no memory of the past events dealing with Ragnarok and Vanille lies about losing her memory as well, taking on the burden of Ragnarok to spare Fang the guilt.
Fang finds her l'Cie brand scorched and unchanging but Vanille's brand is still active, and over the next two days Fang tries to remember their Focus to prevent Vanille from becoming a Cie'tha crystalline monster a l'Cie who fails their Focus transforms into. They take her outside and watch over her until she regains consciousness and leaves. Fang thinks their Focus has something to do with attacking Cocoon and two days later, using stolen ID cards, they board a train to Euride Gorge to see its fal'Cie, Kujata.
Fang proposes she and Vanille attack it to restore their memories but before they can make their move, Sazh Katzroy 's son, Dajhhappens upon them. Realizing the depth of the situation, the two flee before Sazh finds them. Sanctum troops flood the facility and Fang forces Vanille to escape alone. Fang fights off their pursuers and returns to the town of Bodhumbut is captured by the Cavalry the next day. When Rygdea returns from Bodhum empty-handed the following day, Fang is not surprised he did not find her.Final Fantasy XIII - Vanille & Fang's Reunion
Fang asks Lebreau about Vanille. When Vanille tells Serah about her dilemma, Serah advises her to find a way to overcome it. She tells Vanille about her nightmare of destroying the world and how she tried to run from it, but now knows she will get through with her friends' help.
Vanille apologizes for her role in Serah becoming a l'Cie, but Serah is oblivious to Vanille's involvement and does not understand. Two days later, Vanille attends Bodhum's fireworks festival. Inspired by her meeting with Serah, she wishes for Cocoon's safety. The next morning, the Sanctum announces its discovery of Anima within the Vestige and quarantines Bodhum in preparation for the Purge. Unable to return to the Vestige, Vanille goes to the station hoping to return to Euride and look for Fang, but finds the walkway blocked off.
Evading soldiers, she returns to the shopping mall before making her way back to a field by the beach to spend the night. The following day, Vanille returns to the station and queues for the Purge train, noticing Lightning and Sazh Katzroy line up as well. She bumps into Hope and Nora and decides to board the train with them in the hopes of returning home and escaping her Focus.
Edit No one ever said the future would be easy.
But I think we all saw the glimmer of a dream, somewhere in the sky that night. The tiniest spark of hope that we could change our fate. That moment has come and gone. Since Hope blames Snow for his mother's death, Vanille encourages him to approach Snow, but he leaves before Hope has the chance.
Vanille and Hope steal Gadot 's airbike and follow Snow to the Vestige. They crash-land inside and Vanille recovers her weapon. They are saved from a Cie'th ambush by Snow and accompany him. Serah asks Lightning to save Cocoon and transforms into a crystal, meaning she had fulfilled her Focus, mystifying Vanille. Vanille pretends that she, too, had just been branded by Anima.
The group interprets their Focus having something to do with Ragnarok and destroying Cocoon, although Snow remains positive their Focus is to follow Serah's wish to save it. Soon after leaving Snow behind with Serah's crystal, the party happens upon a Sanctum airship, which Sazh pilots out to the skies of Cocoon.
The airship comes under fire from a wave of enemy ships and crash-lands in the Vile Peaks. Lightning announces she is heading for Eden to destroy its patron fal'Cie and take down the Sanctum, Cocoon's government.
Lightning leaves with Hope chasing after her, and Sazh and Vanille choose to run from their fate in the opposite direction. On their way to Nautilusthe two arrive in the Sunleth Waterscape and Vanille asks Sazh about his family.