solipsist comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapter 104 - Less Wrong Discussion
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Comments (189)
Some others, off the top of my head.
Harry knows enough mind-magic to make a person forget every life memory involving the color blue, or their left arm (or cough their animagus form cough)
The imprisoned Beatrix had as much magic as a first year student, and it was considered conceivable that she could complete an animagus transformation. Harry's animagus form, like his Patronus form, would be a person.
Harry has mental ability to become whoever he believes he is.
Cedric Diggory and the Weasley twins have enough magic to cast the spell of cursed fire, which can destroy powerful magical devices (such as Horcruxes and the Deathly Hallows).
Cedric has a time-turner
Weasleys are the heirs of Gryffindor.
Also the controlled transformation Harry learned about in Chapter 104.
Harry won't have enough magic to cast the killing curse for a few years. The character of Lesath Lestrange only exists to give Harry a minion who can cast the killing curse.
We don't know that he can do so deliberately. It's equally plausible that those are examples of his inability to target his obliviations narrowly enough, or even of his general inability to satisfactorily control them.
Where are you getting this? There is no stated link between Patronuses and animagi, and if you're thinking of animagi in animal form being of less interest/resistant to Dementors, it is much more probable that this is because an animagus's thought patterns become more animalistic when transformed (as we know from Quirrell and McGonagall's testimonies), and animals are naturally oblivious to Death.
Do we know this? The only information I recall is that Harry isn't yet capable of casting it. We don't know at what age it becomes feasible. (that and the odds of Quirrell teaching it to them seem rather low)
In canon there appears to be some kind of "one animal per person" rule. The only people where we know both their animagus form and their patronus are James Potter (stag) and Minerva McGonagall (cat), and in these two cases they match. Additionally, Remus Lupin, a werewolf, has a wolf for a patronus and Dumbledore, who is very close to Fawkes, has a phoenix.
That's true. But to me the evidence suggests that "Harry can't create an animal Patronus because he sees that animal Patronuses work through self-deception" rather than "Harry's Patronus animal is a human".
Unrelated conclusion: fursonas are HP canon.