Since we don't have much information, Leo Grande could be just an ordinary person in the story. Maybe he's a local in a community where the story is set.
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.
Maybe he was sharing his experiences in the music industry. He might have told her about his journey of creating music, the challenges he faced, and how he overcame them.
Another fanfiction could be set in an alternate universe where all the characters from Victorious have superpowers. Ariana Grande's character discovers she has the power to control sound, which she uses both for good, like helping her friends in their performances, and for some comical mishaps when she can't control it properly.
Ariana Grande adult fanfiction is generally not appropriate. Fanfiction should respect the artist's image and not involve inappropriate or unethical content. Ariana Grande is a public figure, and creating adult - themed fanfiction about her can be seen as disrespectful and invasive of her privacy.
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.
Well, obviously Deku in two forms - the younger and the older version are the main characters. The younger Deku is the one who is still growing and learning, while the older Deku has more experience.
One possible plot could be that Villain Deku is on a mission to undermine the hero society and crosses paths with Hero Deku. They engage in a fierce battle where Villain Deku taunts Hero Deku about his ideals. In the end, Hero Deku manages to get through to a small part of Villain Deku's conscience, leaving him with some doubts about his villainous path.