Aizawa is still going strong in the manga. There's no event or storyline that has resulted in his death. The creators have chosen to keep him as an active character.
The students of Class 1 - A are often involved. For instance, Midoriya might be portrayed as being unjustly treated by Aizawa, and the fanfic could focus on Midoriya's struggle against Aizawa's supposed unfairness. Bakugo could also be in the story, maybe being in conflict with Aizawa's disciplinary actions.
The relationship could develop slowly. Deku would likely admire Tsuyu from afar at the beginning. Then, they could be involved in group activities where they start to work together more closely. Deku would notice Tsuyu's kindness towards others and her determination. Tsuyu, in turn, would see Deku's growth and his unwavering spirit. As they get to know each other better, their relationship would progress from acquaintance to friendship and then to something more romantic.
In tsuyu lemon fanfiction, one characteristic could be the exploration of Tsuyu's personality in a different light compared to the original source. It might also include scenarios that are not part of the official story, like her being in a romantic relationship with a particular character. And due to the 'lemon' aspect, there could be some degree of physical closeness and emotional vulnerability depicted in a more explicit way.
Tsuyu Lemon fanfic often emphasizes their contrasting personalities. Tsuyu is usually calm and collected, while Lemon might be more energetic. So, the fanfic may play on these differences for comedic or dramatic effect.
Another fanfiction could be set in an alternate universe where Naruto and Tsuyu are students at the same school. They could be in different classes but end up working together on a school project. Tsuyu's calm and collected nature would contrast with Naruto's more boisterous personality, leading to some interesting interactions and character development.
One great 'aizawa shouta fanfic' is 'Aizawa's Quiet Moments'. It beautifully captures his calm and reserved nature. The story delves into his daily life at UA High, showing his interactions with students and fellow teachers in a very heartwarming way.
One common theme is his role as a teacher and mentor. Many fanfics explore how he guides and influences his students at UA. Another theme is his mysterious past. Writers often like to uncover bits of his history that are not fully shown in the original work. Also, his relationship with other characters, like his colleagues at UA, is a popular theme.