I really like the fan fiction 'All Might: The Early Days'. It delves into All Might's backstory, exploring how he got his powers and the challenges he faced before becoming the symbol of peace. It gives a deeper understanding of his character.
Bakugo might initially be in denial. He's always had a complex relationship with Izuku, and seeing him in such a state could shatter his world view. He might become more withdrawn or, on the contrary, be spurred into a violent rage against whoever was responsible.
One common theme is mentorship. All Might is Deku's mentor, so a lot of fanfics explore how he guides Deku, like teaching him how to use his power effectively.
The straight guy might initially be in a state of disbelief. He could then get angry, feeling that his boundaries have been crossed. However, he might also be confused. Maybe he has some underlying feelings that he wasn't aware of before, which could lead to a period of self - reflection.
Archive of Our Own (AO3) is also a great place. It has a large collection of fan fiction, including many about All Might. The tagging system makes it easy to find exactly what you're looking for in terms of genre, length, and more.
One great fanfic could be 'All Might's Legacy' which beautifully explores the relationship between All Might and Deku. It shows how Deku grows under All Might's mentorship and the emotional bond that forms between them.
Mineta could react with a mixture of embarrassment and defiance. He's a proud character in his own way. So when All Might yells at him, he might try to put on a brave face and argue back a little. But deep down, he knows he's in the wrong. Eventually, he'll break down and start crying, realizing that he has disappointed not only All Might but also his classmates who are all striving to be heroes.
The world would be in shock. The media would be filled with reports of his death. Civilians who had always seen him as a symbol of safety would feel vulnerable. There would be mass mourning in the cities he had protected.
He might be nervous. Since he is not attracted to girls in a sexual way, he may be worried about leading her on or not meeting her expectations. He could be overly polite to keep a distance.
One great 'Naruto Might Guy fanfiction' is 'The Unstoppable Might Guy'. It really captures his spirit. It shows him in various challenging situations where his determination and unique fighting style shine through.