I don't think it is. Usually, such stories are fictional creations to entertain the audience. But it might draw inspiration from some real-life elements in a generalized way.
In general, the Evangelion mangas are considered good. They expand on the anime's universe, providing more depth and character development. However, it depends on personal preferences as some might find the style or pacing not to their liking.
They can significantly increase public awareness. When people hear the real - life stories of organ donor families, it makes the concept of organ donation more tangible and relatable.
Perhaps. The Evangelion fandom is known for its active participation in creating and consuming fan works. 'evangelion the one i love is fanfiction' could be popular if it manages to resonate with the fans' emotions and expectations. For example, if it delves deep into the complex psychological aspects of the characters, similar to the original series, it might gain a following. Also, if it provides a fresh perspective on the love stories within the Evangelion universe, it could attract a lot of readers.