One great fanfiction is 'Unlikely Allies'. It explores their relationship in a world where they have to team up against a common enemy. The author does a wonderful job of showing their different personalities clash and then gradually come to understand each other.
Wade Wilson is a complex character. He's a former Special Forces operative who becomes a mercenary with a twisted sense of humor and a regenerative healing factor. His story is filled with action, comedy, and tragedy.
There's 'Across the City'. In this fanfic, Peter and Wade cross paths during a city - wide crisis. The story delves into how they start to rely on each other, with Wade's unorthodox methods and Peter's strategic thinking. It's full of action scenes and also some tender moments between the two characters as they get to know each other better.
Another reason is that both characters have a large fan base on their own. When you combine them in a fanfic, you're bringing together two beloved characters. Fans of Peter can see him in a new light with Wade around, and vice versa. Plus, the potential for both comedic and emotional storylines is huge, which attracts a lot of readers.
Another possibility is that the 'Wade Wilson Killer' is a character with special abilities or skills that are designed to counter Deadpool's own powers. Maybe he has the ability to nullify Deadpool's regeneration factor or has some sort of mind - control power that can turn Deadpool's allies against him. But all of this is just speculation until we have more information about the specific story in which this 'Wade Wilson Killer' exists.
The age of Wade Wilson in the comics is somewhat fluid. Sometimes he's shown as being in his late 30s, while in other stories he might be closer to 40. It all depends on the context and the creative decisions of the writers and artists.
The 'hurt/comfort' trope is also quite common. Wade might get into some dangerous situations, and Peter uses his powers to save him or vice versa, which then leads to a deeper emotional connection. There are also fics that play with the 'fish out of water' trope, especially if Wade is introduced into Peter's more normal life in Queens, and his chaotic nature disrupts Peter's routine in an interesting way.
The popularity lies in the contrast of their characters. Peter is young, idealistic, and has a strong moral code as Spider - Man. Wade, on the other hand, is a bit more of an anti - hero with his own brand of humor and chaos. Their interactions are full of potential for interesting storylines.
I'm not sure which specific 'Wade Wilson Killer' you're referring to. There could be many characters with that name in different fictional universes. Maybe it's from a particular comic book series? Without more context, it's difficult to tell the full story.
The hooker could be a plot device to show the darker side of the city that Peter Parker and Wade Wilson inhabit. For example, she could be a victim of some new super - powered criminal's evil scheme, and they have to save her.