The key element is his tough upbringing in Crime Alley. Another is his encounter with Batman while trying to steal. And finally, his acceptance into the role of Robin.
The key elements are his deformity as a child, his drowning at Camp Crystal Lake, his mother's revenge killings, and his own resurrection as a killer.
Jason Todd's origin is a story of a troubled kid turned hero. He grew up in poverty and with little family support. After his encounter with Batman while attempting to steal from the Batmobile, he was given a new chance at life. Batman saw potential in him. Jason had to overcome his past hardships and learn the skills to fight crime beside Batman as Robin.
Characterization is key. The writer needs to accurately portray Jason Todd's complex personality, including his dark past and his softer side. Also, the development of the relationship between Jason and the reader. It should be believable and not rushed. For example, in some fics, they start as friends and slowly fall in love, which is a great way to build the relationship.
One special thing is that it delves deep into the origin story of Jason Todd. It shows how he became part of the Batman universe, his early life experiences that led him to take on the mantle. It likely has unique art styles that bring his story to life vividly.
The key features often include its unique art style that brings the story of Jason Todd in the Batman universe to life. It may have dark and moody visuals to match the tone of the story.
Obviously, Jason Todd is the main character. But Batman is likely to be a major presence as well, since he has a big influence on Jason's story.
One key event is his gradual descent into madness. He started off normal but then became obsessed with making toys in a very particular, and often disturbing way.
Characterization is key. You need to really understand Jason Todd's personality. He's often brooding and has a sense of justice that's been warped by his past traumas. When writing him in a 'Rewrite the Stars' context, you have to show how he deals with emotions like love and hope, which are central to the song. Another element is the relationship with the other character. It should be complex and full of growth. For example, they might start off not liking each other but gradually find common ground.
Perhaps Jason Todd will face a new villain. A villain who has a personal vendetta against him, maybe someone from his past who he wronged unknowingly. He'll have to use his wits and fighting skills to survive.
His adoption by Batman is crucial as it starts his journey as Robin. Then, his death by the Joker is a major event. And his resurrection as Red Hood is also very important.