Minerva McGonagall's Animagus form is a cat. Her Patronus is also a cat. We know that James Potter was a stag Animagus, and his Patronus was a stag as well. I'm not sure if Sirius Black's Patronus ever appeared in the books, but I am pretty much sure it would have been a dog.

Is the form of an Animagus directly related to the form of a Patronus?

Just to clarify, in an instance that the Patronus changes (as it is established by canon), does this mean that the Animagus form also changes? Or is it impossible for both to change for an Animagus?

  • Three people does not a good statistic make. – user16696 Jun 20 '15 at 17:54
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    To correct you, I only gave two. But you see, I did not claim that there IS a direct relation, I am asking IF there is one given the observation. – gelolopez Jun 20 '15 at 17:57
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    @Richard it does nothing of the sort. It merely indicates that a patronus can change, based on what happy memory it's tied to. But that doesn't mean that it changes for animagi; perhaps for them it's tied to the same part of their personality their animal form comes from. – SQB Jun 20 '15 at 19:25
  • Thanks @SQB, I have actually edited the question to clarify what exactly I meant and what happens to the animagus form considering the changes of the Patronus. – gelolopez Jun 20 '15 at 19:38
  • Hi @Kevin, Richard, SQB and I were discussing a while ago regarding the duplicity of my question. If you would check the last paragraph of my question, edited for clarification, I am asking about the existence of the connection between the Animagus and Patronus form. – gelolopez Jun 20 '15 at 20:37

This is currently unknown.

The number of people who can cast a corporeal Patronus is vanishingly small. The number of Animagi (registered or otherwise) is even smaller.

James and McGonagall are the only two characters in canon who are in both groups. It could be a coincidence that their Animagus forms and Patronuses happen to be the same; we just don’t have enough information to tell.

The canon has scant information about Animagi who can also cast a Patronus. It just doesn’t discuss this possibility, because it’s so vanishingly rare. So far there aren’t any examples of Animagi who have a different animal form to their Patronus, but the sample is so small that we can’t draw any meaningful conclusions either way.

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