4 crossover fic recs, including one where Ichigo Kurosaki and the Room of Requirement become friends

You know a fic is good when you go through your "things to rec" and other bookmarks multiple times just to find things to make a rec post with asap, because I can't shake the feeling that a rec post should have more than one fanwork. (Currently planned: at least one more CA:WS rec post, one with M.U.N.C.L.E. fic, vid recs, and more hockey rpf.) Then I lose time again because many fics I bookmarked to rec so long ago that I definitely need to reread them first.

There May Be Some Collateral Damage by metisket (Bleach/Harry Potter)
gen, 61k
Summary: Author's Notes: I wrote this mostly because, despite the surprising number of Bleach/Harry Potter fics out there, none of them seem to address the fact that sending Ichigo to Hogwarts is basically the same as swinging a wrecking ball directly into the side of the castle.
So here is an entire fic about that.
Why I loved it: This is so much fun. I don't know Bleach, but that wasn't a problem. Ichigo clearly has a very different perspective than the wizards, and it's hilarious. Hogwarts doesn't know what to do with him, and he doesn't really know what to do with Hogwarts, but he has a job to do and he improvises. There are explosions, and it's all very satisfying.
The crossover works very well (from what I can tell), I liked both the portrayal of the canon characters and became interested in the characters from Bleach. The writing is great, half of my comments were a list of my many favorite quotes from the story. Among all the funny moments there are also some that are genuinely touching (origami!) or both (dusting!)

And three shorter crossovers:

Nerds of the Earth, take note! by Betty, Emeraldwoman (Leverage/MCU)
gen, 8k
Summary by me: SHIELD "recruits" Hardison.
Why I liked it: Very good for my competence kink, yum. It also has Leverage team feelings, Tony angst, and SHIELD being SHIELD.
There is a podfic by susan_voight.

Angels In The Architecture by trace_of_scarlet (Torchwood/Discworld)
gen, 3k
Summary: Jack Harkness has been buried – sometimes alive, sometimes dead – under Cardiff for centuries. Eventually, this was bound to attract attention from someone who TALKS LIKE THIS.
Why I liked it: Not the only fic where Captain Jack Harkness meets Death, but the first one I read and still the one I like best. It's fic that manages to make a horrifying canon situation a little bit better, and it ends with a smile.

When Life Hands You Werewolves by uraneia (Teen Wolf/SGA)
Derek/Stiles, 4.6k, fusion
Summary: Four hours—that’s how long it takes after the Daedalus II drops off the new contingent of baby scientists and Marines before Rodney starts taking bets on who’ll be the first to get into Derek Hale’s pants.
A month ago John's team rescued a former runner named Derek Hale. He's great to have on offworld missions--he's like a danger magnet; nobody else gets so much as a splinter. But there's just something different about him. John can't quite put his finger on it....
Why I liked it: Good old-fashioned fun in Atlantis, gave me a bit of nostalgia for SGA. The fusion works well.
A podfic version is available.