If I recall correctly, Shirou here does act as a consequence of the Archer route. In fact, he is slowly turning to EMIYA, through the murders of the Death Eaters.

As for the vigilante murders of Death Eaters, I must agree, the murders may adversely change Harry Potter plot. Also Adam Greengrass looks like an OC, which also may soon, or have already become a Gary Stu.

As for Magic systems, I do realise that Harry Potter may not have Magic Circuits, and if he does, Shirou may not be able to Project from Harry's body.

Having read nine chapters, I find that Shirou as predictably as he is in his canon. Getting ready to defend himself when thrown to a new situation, hiding informations until it is considered necessary, strategising how to navigate through Potterverse, those are the marks of an Emiya Shirou that has already survived his Holy Grail War.

However, there could be something that I missed from the story.

... and got some very interesting things. First of all, is a triple crossover, is misclassified and is a ten fics long series. Okay explaining now the two first ones now, the fic combines elements from both the Teen Titans animated series and the New Teen Titans comic book series (like Titans Tower being in San Francisco instead of Jump City), that's why it's a triple crossover. Which leads me to the next point, the fic is not a crossover with the Ultimate Spider-Man animated series, is a crossover with the comic book series of the same name. That's why Peter Parker dies at the start of the fic. In fact this gets fixed later by the author by filling parts 3 to 10 under "Ultimate Marvel".

That being said, the things that bothered me were: Peter's unexplained interdimesional travel, Cinderblock's unexplained power and intelligence upgrade, Raven is slightly OOC, and the fact that Spidey's and Raven's relationship progresses a little too fast.

All in all, and considering the continua involved, I judge this crossover to be plausible. Yes, that includes Deadpool's Fourth Wall breaking interdimensional travel. Even Raven falling for Spider-Man, since she actually fell for Beast Boy in the New Earth DCU continuum, and those two are very much alike. And the bit of Deadpool and Deathstroke being siblings, is quite likely a joke, referencing the fact that Deadpool is a parody/rip-off of Deathstroke, a joke even DC Comics has dabbled into. The SPaG gets better as the fic progresses and yes, Ultimate Peter Parker is that awesome, in fact, he's inmortal!

In other words, I won't take any part in any sporking of this fic, I have definitively seen worse and more spork-worthy fics than this one. Is not the best by any means, but I don't see it bad enough for Mission material.

I believe it takes place in Marvel's Ultimate Universe, which is different from Marvel's normal Universe because... reasons. I think.