Peter's death occurs when Norman Osborn returns from his seeming death in an earlier story, where Norman and his son Harry were both seemingly slain at the end. The title of that earlier story should have suggested that one of them was coming back: "The Death of a Goblin."
This goes even further in Miles Morales: The Ultimate Spider-man #1. People are legit surprised that Norman Osborn was still alive however, it was never confirmed that he did in fact die. Nothing of a sort ever led to the idea that Norman Osborn was still alive. People have confirmed Peter's death, but no one said anything of the former billionaire tycoon's death which is a cue that he never died.
The spider that bites Miles snuck into his uncle Aaron's bag while he was burglarizing the abandoned Oscorp facility. So as with Peter, Miles' fate as Spider-Man is directly influenced by a crime involving his uncle even if he doesn't know it yet.
It goes further when his uncle Aaron (the Prowler) blackmails Spider-Man into working with him, mostly by appealing to the responsibility Miles has to his uncle, since it was because of him that Miles got his powers.
Here's another. Issue two ends with Miles upside down on the celing and in a reversal of what Peter reaction was. While Peter's reaction was excited ("This is so cool."), Miles' reaction was more worried ("Oh no.")
A young man gifted with strange powers makes the crucial mistake of not apprehending a thief when he has the chance, allowing a circumstance where the thief causes the death of the boy's uncle. From a Certain Point of View, this is entirely applicable to Miles just as everyone knows it is for Peter. Miles' uncle Aaron (a.k.a. The Prowler) tries to recruit him as a criminal, blackmailing him with revealing his identity as Spider-Man to his super-phobic father. Miles goes along in helping Aaron take down the Scorpion (here a Mexican crime lord) but when Miles draws the line, the two wind up in a battle that ends when one of Prowler's damaged tech gauntlets blows up, leaving him to die before his nephew's eyes in an eerie and twisted echo of the circumstances of Ben Parker's death.
Miles' Venom Strike is treated as a humorous way for him to end fights for the most part. However, there have been hints that there is more to it than meets the eye:
It completely destabilizes the Venom Symbiote, freeing it from it's host with explosive results.
Finally, Norman Osborn is rendered completely helpless (and temporarily de-powered), leading Miles to pound him into paste.
It stops normal villains in their tracks and trashes machinery, but it looks as though the greater amount of genetic instability a character has (Venom and The Green Goblin), the more effective it is against them.
Shouldn't someone of Black Cat's profession where something like, oh, I don't know, a Bullet Proof Vest? Because that big hole in the front of her costume just screams professional thief, and a not something like, say, hooker?
Black Cat doesn't seem like she's too concerned with what people think of her, much less whether or not she looks like a hooker, and the obvious vulnerability in her costume could simply be her way of letting people know that she's too Bad Ass to need a bullet-proof vest. The real question is, how do her breasts not spill out when she's fighting? Her suit would pretty much have to be fused to her chest for it to stay on. And in Ultimate Comics: Spider-man, she has even less support.
A well known panel of the mainline Spidey comics reveals her ample assets act as "ballast", take that as you will. Presumably, her costume is designed to take advantage of that.
Her bad luck powers actively prevent her from sustaining serious injury and she has shown to use it from stopping herself from getting shot so who is say that she doesn't use it to make sure she doesn't use them for preventing nip-slips.