The main differences are in their expressions and some minor details of personality. In the manga, Deku might seem a bit more intense, while in the anime, he's sometimes presented a bit softer.
They could start with simple conversations. For example, Deku could ask Momo for advice on studying or improving his quirk control. These conversations can gradually build trust between them. Then, they might participate in joint hero training exercises where they have to rely on each other. This physical and mental cooperation can strengthen their bond.
The relationship can start with simple admiration. Deku might admire Momo's intelligence and her ability to quickly come up with plans. Momo, on the other hand, could be impressed by Deku's growth and his unwavering spirit. Then, they could be put in situations where they have to rely on each other, like in a team - based mission. This would make them spend more time together and get to know each other better.
For Hero Deku, his development could be shown by how he reacts to seeing his dark self. He might start to question his own beliefs and actions. For Villain Deku, his development could be in the form of a possible redemption arc. Maybe he starts to see the error of his ways through his interactions with Hero Deku. For example, if Hero Deku shows him kindness or understanding that he never received before.
I think it's a toss-up. Deku has potential and is constantly evolving, but Naruto's strength and strategic thinking give him an edge. It could come down to the specific circumstances of the fight.
Deku can use 100 percent in the manga, but it's usually a last resort or when he's facing an extremely powerful adversary. This power boost often has significant consequences for his body and abilities afterward.
Deku might be completely shocked at first. Since Bakugou has always been so aggressive towards him, he would never expect such a confession. He might just stand there, mouth agape, not knowing what to say.
His friends could come to the rescue. Bakugo, for instance, might use his explosive power to break into Toga's hideout. He's always been competitive with Deku, but he also cares about him deeply.
In 'deku meets future deku fanfiction', perhaps the future Deku warns the present one about upcoming threats. He could tell him about villains he'll face in the future and how to defeat them. This would give the present Deku an edge in his battles and also in his growth as a hero.