One great source could be Archive of Our Own (AO3). There are numerous fanfictions there that focus on the relationship between Jason Todd and Rose Wilson. You can search by the characters' names and filter by tags like 'Romance' or 'Adventure' to find ones that suit your taste.
When writing their relationship, it's important to show the chemistry. Maybe start with some banter between them. Jason's sarcastic remarks and Rose's sharp comebacks can create an interesting dynamic. Also, consider their different skills. Jason's combat skills and Rose's martial arts abilities could be used in action scenes that also further their relationship, for example, saving each other during a fight.
Jason Todd would bring a different perspective. He's used to Gotham's gritty underworld, so he'd be more cynical compared to some of the more optimistic Avengers. For instance, he might question the Avengers' grand plans and suggest more street - level, practical solutions.
Jason Todd would likely cross paths with Doctor Strange. Their worlds are very different, with Jason being more of a street - level fighter and Doctor Strange dealing with magic and otherworldly threats. But their encounter could lead to Jason learning about different forms of power and Strange might be interested in Jason's tenacity and willpower, which could be useful in his own battles against the forces of the dark dimension.
Jason Todd's age varies depending on the specific comic storyline and continuity. But generally, he's often depicted as being in his late teens or early twenties.
The fanfiction often delves into their psychological aspects as well. Dick may struggle with his feelings towards Slade, whether it's hatred, respect, or a strange form of attraction. This internal conflict makes for very interesting reading as it shows different layers of his character.
The 'enemies to reluctant allies' trope is quite common. They start off as foes but due to certain circumstances, like a common enemy or a shared goal, they have to work together. This usually involves a lot of bickering and tense moments.
One great Slade Wilson OC fanfiction could be 'The New Ally'. In this story, an original character with unique powers teams up with Slade Wilson. The OC's backstory is well - developed, showing how they overcame hardships and how their morals contrast and complement Slade's. Another interesting one is 'Slade's Unlikely Companion'. It focuses on the relationship between Slade and an OC who is a healer. The dynamic between the two, with Slade being a ruthless assassin and the OC being a gentle healer, creates a lot of engaging plot twists.
In the comics, Slade Wilson lost his eye during a fierce battle with a powerful enemy. The exact circumstances can vary depending on the specific comic storyline.