Another theme is sacrifice. Given their complex relationship in the original story, fanfics often play with the idea of one sacrificing for the other. For example, how Satoru might sacrifice his own well - being for Suguru or vice versa. It adds a lot of emotional drama to the stories.
The distinctiveness of satosugu manga panels lies in their ability to convey complex emotions through simple yet powerful imagery. The use of shading and highlights adds depth and texture, making the panels more immersive for the readers.
Another good one is 'Shared Destiny'. This fanfic explores the idea of them facing challenges together and how their bond helps them overcome difficulties. The author does a great job of bringing out the nuances of their relationship.
He would probably be quite amused by some of his past antics. For example, his constant pranks on Iruka-sensei. But at the same time, he'd also see the pain he carried from not having his parents and realize how that influenced his actions. He might react with a bit of regret for some of the stupid things he did out of loneliness, but also be glad that those experiences made him who he is today.