Hawk's appearances in Spenser novels aren't consistent. It could be early on in some, while in others, it might be later. It really depends on the narrative and the author's creative choices.
The gimp comes into the picture at a crucial point in Pulp Fiction. It's not easy to remember exactly when off the top of my head, though. You might want to rewatch the movie to find out for sure.
Albedo makes her first appearance relatively early in the light novel. But the exact chapter or volume might vary depending on the specific edition or translation.
Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
The merchant usually shows up at specific times depending on the game's progression and events. But it can vary from one version of the game to another.
The Arbiter makes his appearance at different points depending on the specific Halo novel. It varies, so it's hard to give a precise answer without knowing which specific novel you're referring to.
The mockingbird makes its debut relatively soon in the novel. However, the precise moment might differ based on the printing and any editorial changes. It plays a significant role from an early stage.
It's hard to give an exact time as it depends on the manga's plot development. But typically, Yuta Okkotsu shows up when certain events and character arcs lead to his introduction.