Well, you can try searching on some popular fanfiction platforms like Archive of Our Own. There might be a variety of 'shinji gun girl' fanfictions there.
One common theme is redemption. Characters, especially Shinji, often seek to atone for past mistakes or find a new meaning in life within the context of the Gunslinger Girl world. Another theme is the power of relationships. The bonds between Shinji and the Gunslinger Girls can be a source of strength or conflict.
A really cool one is 'Gunslinger Girls: Shinji's New Purpose'. It starts with Shinji getting involved with the Gunslinger Girls by accident. As the story progresses, he discovers his own strength and purpose within this new and dangerous world. The character interactions are well - written and engaging.
He could meet his future self. His future self might be wiser, having learned from all the experiences in the past. They could have a deep conversation about Shinji's purpose and the mistakes he's made.
Their relationship could be a bit rocky at first. They might argue about how to raise the baby. Asuka might be more strict while Shinji is more lenient. But through these disagreements, they gradually learn to compromise and in the process, their relationship deepens. They realize that they need to be united for the sake of their child.
Another theme is powerlessness. In many of these fanfictions, Shinji snaps because he feels he has no control over his life or the situations around him. It's like a pressure cooker situation where the lack of power finally makes him break.
If we assume there is a non - inappropriate version of'slave shinji lemon fanfiction', the 'Shinji' part would bring in his known character traits from Evangelion like his introversion and his struggle with self - worth. But the'slave' idea could warp his character into a more oppressed state, and the 'lemon' might introduce some form of romantic or sexual tension in an improper way. However, this is all speculation as this type of fanfiction with such a title is likely to be inappropriate and not in the spirit of the original work. We should look for fanfiction that respects the original characters and their development in a positive and ethical way.
One possible analysis could be that the winter setting in the fanfiction might add a sense of coldness and isolation, mirroring the often complex and somewhat detached relationships of Shinji and Rei in the original work. It could be used to heighten the emotional tension between them.
One aspect to consider in Evangelion Rei x Shinji fanfiction is the complex relationship between the two characters. Rei is often depicted as an enigma, and her connection with Shinji can be explored in many ways. Some fanfictions might focus on how they understand each other's loneliness. Shinji, being a socially awkward and troubled boy, and Rei, with her own unique nature, can form a bond that goes beyond the surface level shown in the original anime. This can lead to stories that delve deep into their emotional growth and mutual support.