Personalities doesn't change in 2 years. It takes decades or mostly never. Singing Yuna was aaaarrrgggghhhh moment

In the context of the story it makes perfect sense why her personality is different.

As society in Spira was very strict during the events of FFX, Yuna as a summoner was never allowed to just be laid back and have fun. With Sin finally gone, Yuna was finally free of the strict responsibility she spent her entire life preparing for and could finally let loose and have fun. Everything she grew up believing in turned out to be a lie, so it should be no wonder she acts the way she does during FFX-2. Not to mention the profound effect that her dead lover Tidus also had a hand in shaping her later characterization and dress sense.

It's called character development. Learn to notice it.

Except it doesn't make a lick of sense at all. She was an extremely traditional and religious woman who found out her entire belief and faith system was a lie. Everything she had strived towards and was raised to believe was pointless. Not to mention, her first love disappeared and she barely had any time to even say a proper goodbye. Most people don't just bounce back from that and do a complete 180 on their personality in a mere two years. That's not character growth. That's lazy writing.

In fact, the entirety of Spira was pretty laid-back for a world whose entire religion had just collapsed in on itself. These people (barring the Al Bhed) were deeply religious and spiritual. They relied on Yevon to feel safe, they relied on summoners to give them hope, they relied on sendings to properly mourn lost loved ones, and they relied on their temples to give their communities' meaning. Every inch of Spira is covered in religious iconography. Their society should have been completely shattered during the events of FFX-2. But nope, it basically looks exactly the same 2 years on, and most people just 'got over' the defeat of Sin and their entire belief system being destroyed. There's a brief mention of conflict and lack of purpose with the followers of New Yevon and the Youth League, but that ends as quickly as it begins. FFX-2 should have been a story about Yuna attempting to piece together a shattered society and to help bring the people of Spira together in a world that no longer had a God or creator. Sure, she might have been a bit more fun and cheerful with her inevitable sacrifice no longer looming over her head. But her entire personality wouldn't have changed into a carefree happy-go-lucky idiot a mere two years after the events of FFX basically changed her world forever.

Except, it is canonically connected in the VII Remake. There's a Shinra character in X-2, who is actually shown in a picture on the wall in the Shinra HQ in Remake. Meaning at the very least, X and VII share the same world in the Remake version.

@Snookies12

I thought they said that was just a joke:

―It’s a sequel to VII?!!
Kitase: “No, that was halfway a joke. However, in FFVII’s ending, Holy was supposed to settle things, then it’s suddenly ‘500 years later,’ and there’s been nothing like a sequel for it. There’s room to fill in that gap. There’s room for imagination. Since Nojima-san and Toriyama-san have worked together since then, talk that it could be possible with those staff members built up for a moment.”

―So, how did talk of it as a sequel to VII come up?
Nojima: “I felt that VII and X had a relatively connected feeling, that VII has an essence there.”

―Ehh, so VII and X are connected?
Nojima: “No, there isn’t much to it. For example, what happens when people die is fundamentally the same in my mind. I wrote both stories following the same idea. At times, other thoughts pop up, though. Pyreflies are green here and there, and other colors besides.”

https://thelifestream.net/c...

I think they were just having fun and making a gag out of it.

@Snookies12 those are just easter eggs

Thanks. That pretty much what I read.