In the manga I've followed, Ochako and Izuku haven't shared a kiss. The story mainly focuses on their friendship and superhero development rather than romantic gestures like that.
Well, I'm not sure exactly which ones are the best. But often, looking at the ratings and reviews on fanfic platforms can help. Some stories might focus on a particular scenario where they kiss, like after a big victory or a very emotional moment. You have to dig a bit to find the gems.
The popularity of Izuku and Ochako kiss fanfiction lies in the popularity of the characters themselves. Izuku is the main protagonist, and Ochako is a well - liked female character. Fans are always eager to see their relationship develop further, and a kiss is a significant milestone in any relationship, so it's exciting for fans to read about it in fanfiction.
Perhaps a storyline where Momo is in trouble and Izuku saves her. In the aftermath, with all the emotions running high, they kiss. Or it could be a story where they are both competing in a tournament, and Izuku is injured. Momo tends to his wounds and they share a tender kiss. There are also stories where they are on a school trip and get lost together, leading to a moment of closeness and a kiss.
One possible plot could be that they are in a dangerous situation together. Izuku uses his powers to protect Diana, and in that moment of relief after the danger has passed, they share a kiss. It's a moment of pure emotion and connection.
One great fanfiction could be 'A Moment of Affection'. In this story, the kiss between Izuku and Ochako is a culmination of their growing feelings during a dangerous mission. They realize their true emotions for each other in the heat of the moment, and the kiss is described in a very tender and emotional way.
Well, perhaps there's a plot where Izuku has some sort of power or ability that attracts Kara's attention. They start to train together and during one of their training sessions, a moment of closeness leads to a kiss. Or it could be that they are both in danger and, in the process of saving each other, they realize their feelings and kiss.
It would likely deepen their bond. Their first kiss would make them more aware of their romantic feelings for each other. They might start to be more protective of one another in dangerous situations, not just as comrades but as lovers.
It could occur during a time of self - discovery for both of them. They've been through a lot together and have grown closer. One day, while they're having a deep conversation about their dreams and feelings, Izuku realizes how much Ochako means to him. He nervously approaches her, and their first kiss is a slow and gentle exploration of their new - found romantic feelings.
He would likely be more confident. Having the powers of the Human Torch gives him a new level of strength. So he might stand up straighter and be more assertive in his actions.