The second book, nearly the start of the series, centers around a diary that is nearly indestructible, can possess others, and can reconstitute Voldemort after his death.
It was fireproof. No other conventional type of damage ever occurred to it. (ETA: oops.) Those other properties you mention are evidence that the idea of Horcruxes had not been settled on when the diary was created- none of the other Horcruxes were independent, sentient copies.
(Incidentally, did anyone else think Arthur's line about "never trust anything that can think for itself if you can't see where it keeps its brain" was hilariously stupid? Tons of magical stuff can think, and absolutely none of it has a brain.)
ETA: Amusingly, canon!Professor Quirrell was apparently a "pseudo-Horcrux".
It's fireproof, it doesn't get damaged by water, and it can't have the pages torn out. Ginny tried to destroy it in a variety of ways offscreen and wasn't successful.
The only other Horcrux we get to see much of, the locket, constantly attempts mind control for about half of the 7th book. Luckily the heroes already know about it's power of mind control and keep trading off the locket to prevent possession. Plus, they're not impressionable eleven year old girls. IIRC the other Horcruxes are described as attempting similar but get such minor screentime they're destroyed before it matters.
The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: