It's The Size of Peter's Head after all
No, it was one of the children. The others would have seen if it was the big one. And the size meant all dimensions. the main body would be a little bigger than your nose, while its legs could cover your entire face. Just imagine a goliath spider, but slightly bigger, and longer legs. (Still enormously terrifying.)
I think one spider contains the canon powers only, and the other spiders contain an extra element in addition to the canon powers.
I can clarify on this one, and probably should. This is not the case.
how it's not going insane and is literally called the Maddening Spider
There is always some madness in love. But there is also always some reason in madness.
core abilities of, well, Spider-Man
Aye, therein lies the rub, doesn't it. Spider-man has had many incarnations over the years, and each one has been kind of unique in their own way. And his powers have varied as well - from invisibility to electric shocks, from tech to magic - different spiders, different abilities. As they say in the movie -
Anyone can wear the mask.
Plus, this is an AU, and things have already changed. Aunt May is dead, instead of Uncle Ben, and his lesson has been about empathy, not responsibility. He may have the name Peter Parker, but our guy is different. That's why it says AU on the title.
The comics have shown Peter Parker with varying levels of smartness - he has been compared to Iron Man and Reed Richards. The problem is, he doesn't quite live up to the label. Sure, he invents gadgets to beat up his enemies, but they're kind of gone when the next one comes around. He never has a power-up, or it disappears when the next author starts writing - partly because the comics want to keep portraying him as an underdog/relatable guy, or somehow, they never work out well, and he must always be self-sacrificing.
In this quest, Peter Parker was always going to be smart (even if you hadn't picked the Intellect option). It wouldn't be enough to reflect numerically, but he would still be able to come up with clever plans for beating his enemies. By picking the Intellect option, you've upgraded him to the level of a really good comic book engineer (nearly equal to any of his science villains, lesser than Stark/Reed, because he lacks resources/experience/talents or any other reason). If you could upgrade it one more time, the Intellect would act as a superpower in itself, and you'll start receiving narrative talents based on that.
Also, every chapter after the first is taking account of your choice. You're smarter cause you chose the intellect option. If you'd chosen something else, the scene would have been slightly different.
hundreds of friendly spiders can breed
But should they?
I'll close the vote a while later, but I believe Thinking Spider is going to take it. Surprisingly unexpected and bold.