Bakugou could use his words. He might tell Deku that he believes in him. For example, he could say 'Deku, you may be a nerd but you're a strong nerd.' It's a backhanded compliment but it shows he has faith in Deku.
Whether Will comforts Nico in fanfic can be quite unpredictable. It all comes down to the creativity and direction of the writer. Some fanfics might focus on building that kind of emotional connection, while others might take a different path.
One popular 'kakashi comforts naruto fanfic' is 'A Father's Comfort'. In this fic, Kakashi finds Naruto feeling down after a difficult mission. He takes Naruto out for ramen and then they sit by the river. Kakashi shares his own past experiences of loss and loneliness, making Naruto feel understood and less alone.
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.
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.
There's 'Sirius' Guidance' which is quite good. In this fanfiction, Sirius sees a lost and confused Draco in the halls of Hogwarts. He decides to take Draco under his wing, much to the surprise of everyone. It shows how Sirius uses his Gryffindor courage and big - heartedness to break through Draco's Slytherin - like defenses.
One popular 'naruto comforts konan fanfiction' might be 'The Healing Touch'. In this fic, Naruto finds Konan after a difficult battle. He uses his kind words and positive energy to comfort her. He tells her that she's not alone and that there are always people who care about her.