One possibility is that Naruto would spend the day training. He's always been dedicated to getting stronger, and Valentine's Day might be no different. He could be out in the forest, practicing his new jutsu, lost in his thoughts about how to protect his friends and the village.
In a fanfic scenario, Naruto could also be on a solo mission on Valentine's Day. As he travels alone, he might come across a small village that is celebrating Valentine's Day in a very different way than he's used to. He could get involved in their celebration, make new friends, and learn about different kinds of love, not just the romantic kind.
Naruto may write letters to his friends who are away. He could pour his heart out in these letters, talking about how much he misses them and how he's doing. Writing can be a very therapeutic way to deal with loneliness. He might even include some little drawings like he used to do when he was a kid.
They might attend a Valentine's Day party together. At the party, Beast Boy tries to dance but is a bit clumsy. Raven, though initially hesitant, joins him and they end up having a great time, their relationship growing stronger through this shared experience. They then leave the party early to stargaze and talk about their future.
Perhaps it's the day he becomes Hokage in the fanfic. He has worked so hard for it. He would stand in front of the whole village, giving an inspiring speech about unity and protection. His friends and family would be so proud, and it would be a very emotional and exciting moment for everyone.
There could be kids exchanging valentine cards. For example, they might write simple messages like 'Be my friend' or draw little hearts on the cards.
One possible horror story could be that a person planned a perfect Valentine's Day date for their partner. They made a reservation at an expensive restaurant months in advance, bought a beautiful gift, and dressed up nicely. But when they arrived at the restaurant, they found out that the reservation was lost. To make matters worse, their partner was really looking forward to this and got extremely angry, and the whole night turned into a screaming match instead of a romantic evening.
Oh, there could be all sorts of romantic tales. Maybe a surprise proposal, a fancy dinner date, or a couple rekindling their love.
In a fanfic where Naruto is trained by Vincent Valentine, the story could take some exciting turns. Vincent's experience and skills could help Naruto expand his understanding of combat beyond what he learned in the ninja world. For example, Vincent's knowledge of the Lifestream could give Naruto new insights into the energy in his own world, like chakra. Naruto might also adapt Vincent's stealth and infiltration techniques, which would be a great addition to his ninja skills. This could lead to new and thrilling adventures as Naruto uses these combined skills to face stronger enemies and protect his village in ways he hadn't thought of before.
In this fanfiction scenario, Naruto could potentially use new and untested jutsu. He might draw on the power of his nine - tailed fox in a completely different way. Maybe he'd combine Sage Mode with some secret Uzumaki clan technique he discovers during the fight.
In this fanfiction, Naruto could be visited by the spirit of his father, Minato. Minato could offer some words of wisdom and comfort to Naruto on his birthday. They might have a heart - to - heart conversation about Naruto's growth as a ninja and his future in the village.
It could be a story where a person decides to do something crazy and unexpected for their loved one on Valentine's Day, like a spontaneous road trip or a unique proposal. Or perhaps it's a story of a misunderstanding that gets resolved in a sweet way during the celebration.