Maybe there will be a competition or a test in the DADA class that Harry is teaching. Tom could either shine or struggle, and this could affect his relationship with Harry. If he does well, he might gain more respect for Harry and DADA. If not, he could become determined to improve.
Well, it could be that Harry's hands - on experiences from his own time at Hogwarts make his teaching really engaging. He might share his encounters with dark creatures and how he overcame them. This could make Tom more aware of the practical side of DADA.
As the teaching progresses, they could develop a sort of mentor - mentee relationship. Harry would be constantly trying to steer Tom away from the Dark Arts, while Tom would be trying to learn as much as he can from Harry. However, there would always be an underlying tension because of Tom's future as Voldemort. Their relationship might be a complex dance of trust and suspicion.
In this fanfiction, Harry teaching DADA could lead to some really creative storylines. He might invite some of his old friends, like Hermione or Ron, as guest lecturers. They could share their own knowledge and experiences, which would add a lot of variety to the classes. Also, Harry could start some sort of mentorship program for students who show a particular aptitude in DADA.
Maybe Harry would teach Tom about the consequences of dark magic. Since Harry has faced Voldemort multiple times and seen the destruction caused by dark spells. He could use these real - life (well, in the wizarding world) examples to make Tom understand that there are other paths in magic that are more positive and life - affirming.
You could start by searching on platforms like Archive of Our Own. There might be some great 'harry teaches dada fanfiction' where the author delves deep into how Harry reforms the DADA curriculum. Maybe he focuses more on practical self - defence against dark magic rather than just theory, and the story shows how the students respond to this new approach.
For Harry, he could become more confident in his teaching abilities. He has always been a learner, but now he has to be the one imparting knowledge. The Marauders might develop a new respect for the importance of DADA. For instance, Sirius might see it as more than just a subject to goof around in. Remus could gain new insights into teaching methods that he can later use when he becomes a teacher himself at Hogwarts.
One possible plot could be that Harry, using his knowledge of love and friendship, tries to teach Tom about the power of positive emotions. He might show Tom how his own journey was shaped by the love of his friends and family, in contrast to Tom's more solitary and power - hungry path. Maybe Harry takes Tom to Hogwarts in a time - travel like scenario and shows him the true meaning of the houses, not just the pursuit of power within Slytherin.
A lot could occur. Harry might try to instill in Tom the importance of forgiveness. Given that Harry has forgiven many of his enemies, he could explain to Tom that holding grudges and seeking revenge only leads to more pain and destruction. For example, when he forgave Snape in the end.
Sanguini's character development could be centered around his transformation from an outsider figure to a respected teacher. At first, the other professors might be skeptical of him teaching DADA. But as he proves his worth through his unique teaching methods and knowledge, he gains their respect. He could also form special bonds with some students who are interested in the darker aspects of magic. He would teach them not only how to defend against dark forces but also how to understand and co - exist with them in a way, which is a very different approach compared to traditional DADA teachings.