Despite giving concrit for the original (and then missioning it, though that is likely unknown by the author and is better that way), the remake was... well, actually worse on a logic standpoint.

However, no more than a single chapter was ever written of it, so we didn't have enough material for a mission.

Fun fact: two of the Agents involved in the original would have been retired by the time the remake would have gotten missioned, so they would've been there unofficially, and another Agent who was recruited from that badfic would've ended up being dragged into the new fic (Poor Theia).

Of course, finding yourself in a much larger body might be very confusing for someone like Corolla, who is normally a few inches tall.
Generally speaking disguises are like a new body; you have to get used to them. Remember how Za'kiir had problems with a human disguise since he's a Khajiit and they have digitigrade feet?

Maybe I'm not understanding the question. What are you trying to get at?

~Neshomeh

1. The structure of the codes is explained on the relevant wiki page. They're picked by anyone who feels like it, basically. There isn't a full list because not many people have bothered.
   
   2. Hard to say. Missions usually end before the actual fic does, especially if it's a really long fic. You'd probably have to do some serious research to find that out. Or, do you mean what's the longest mission to a single fic? ... You'd probably need to do some serious research to find that out, too, but I'd recommend starting with Herr Wozzeck's and SkarmorySilver's spin-offs.
   
   ~Neshomeh

If you're asking about the 2003 Murakami series, I guess I know it kinda well.