Perhaps Shirou becomes an Avenger due to a misinterpretation of his ideals. He always wanted to be a hero who saved everyone, but in a world where his actions are constantly misconstrued and lead to more harm than good. He could be driven to the point where he believes that only by taking revenge on those who wronged him and his loved ones can he set things right. This would be a very complex and angsty storyline.
A plot possibility could be that Shirou has to keep his transformation a secret at first. He's afraid of how others will react, especially those he cares about. So he tries to act as normal as possible while dealing with the physical and emotional changes privately. Another could be that some sort of magic gone wrong caused the transformation, and he has to find a way to reverse it while also using his new form to his advantage in battles or other situations.
He would likely become more cynical. In the normal story, Shirou is fairly idealistic. But as an Avenger, he'd see the darker side of things more often. For instance, he might not trust people as easily as he used to. He would always be on the lookout for hidden motives.
Sure. There are some great ones out there. A lot of fanfiction writers like to take the concept of Shirou as an Avenger class and run with it. They might create new storylines that deviate from the original Fate plot, giving Shirou different powers and interactions. It's really interesting to see how different authors imagine his character in this class.
One common theme is redemption. Given the nature of the Avenger class, many stories might have Shirou trying to atone for something. Another theme could be power struggle, as he might have different powers as an Avenger compared to his normal self. Also, identity crisis is quite common as he grapples with his new role and what it means for him.
A plot could involve Shirou being transferred to the Highschool DxD school. He quickly catches the attention of Rias and her peerage. His different style of combat and his unwavering determination might lead to some friendly rivalries within the group. He could also introduce some new concepts of magic that the DxD characters have never seen before, like his ability to reinforce objects. And he may find himself in the middle of the power struggles between the different factions in this new world.
One plot idea could be Dark Shirou in a post - apocalyptic world where he uses his skills to survive and rule a small territory. Another could be his journey to find a way to reverse his dark transformation. Or a plot where he has to face his darker self in a psychological battle within his own mind.
His projection magic might be affected by the different magical rules in the Highschool DxD world. Maybe it becomes more powerful or has some new limitations. For example, projecting holy swords could have a different energy cost or be more effective against certain types of devils or fallen angels.
Well, it could be that Peter starts off as a regular guy who is just a huge fan of the Avengers. Maybe he follows all their news, collects their merchandise. One day, he gets a chance to meet them somehow, like through a Stark Industries internship. Then he gradually proves himself useful to them and they start to train him. Eventually, he becomes part of the team, with his own unique skills like his spider - powers adding to the Avengers' strength.
Well, perhaps Harry discovers the Avengers through some magical means like a spell gone wrong that transports him to the MCU world. He could be in awe of their powers and decide to learn from them, and then try to incorporate their fighting styles into his own magical battles.
The visual novel mainly focuses on the relationship between Tohsaka Rin and Emiya Shirou. It involves their journey in the Holy Grail War. They face various challenges and battles together, while also exploring their own growth and the complex emotions between them.