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Rereading the Prisoner of Azkaban, this interesting question(at least to me) popped in my head. What shape would a boggart take if a person is never depressed about anything, has no evil memories whatsoever for the boggart to feed on or has no fear?

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Richard Sherman? – General Decline Jul 9 '14 at 22:36
Of a boggart with an identity crisis. – Voldemort Jul 9 '14 at 22:47
Midway through, I imagine they'd fear getting an "F" on the Boggart exercise. ; ) – Meat Trademark Jul 9 '14 at 22:51
@voldemort - That seems highly likely. – Valorum Jul 9 '14 at 22:54
Ricky (of rickrolling fame)? Also, virtually EVERYONE has phobias. Snakes are nearly universal for evolutionary reasons. – DVK-in-exile Jul 9 '14 at 23:31
up vote 11 down vote accepted

In-canon, no-one knows.

Per pottermore;

A Boggart is a shape-shifting creature that will assume the form of whatever most frightens the person who encounters it. Nobody knows what a Boggart looks like if nobody is there to see it, although it continues to exist, usually giving evidence of its presence by rattling, shaking or scratching the object in which it is hiding. Boggarts particularly like confined spaces, but may also be found lurking in woods and around shadowy corners.

It's not even apparent whether a boggart actually has a physical form, but rather manifests as a force of nature;

Like a poltergeist, a Boggart is not and never has been truly alive. It is one of the strange non-beings that populate the magical world, for which there is no equivalent in the Muggle realm. Boggarts can be made to disappear, but more Boggarts will inevitably arise to take their place. Like poltergeists and the more sinister Dementors, they seem to be generated and sustained by human emotions.

Out of universe, there are very few people that lack a fear response and even those individuals (extreme psychopaths, sufferers of Urbach-Wiethe) do have a psychological (but not physiological) ability to identify things that they dislike highly, even if they lack the mental capacity to actually feel a fear response.

It's possible that they would have the same response as a muggle;

The more generally fearful a person is, the more susceptible they will be to Boggarts. Muggles, too, feel their presence and may even glimpse them, although they seem less capable of seeing them plainly and are usually easily convinced that the Boggart was a figment of their imagination.

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I wonder if Moody knows what a Bogart's true form is. Remember the incident at Grimmauld place with the Bogart in the cabinet? – Mooz Jul 10 '14 at 5:17
He does indeed or at least it was implied. @Mooz – CandiedMango Jul 10 '14 at 8:11
@simon - implied but not stated. Also it doesn't answer the question of what it looks like. – Valorum Jul 10 '14 at 9:19
Never said it did state what it looks like, however for him to recognize the Boggart in the cabinet he must know what one looks like. – CandiedMango Jul 10 '14 at 9:20
@simon - except that that ignores the statement from pottermore and the books that no one knows what they look like. – Valorum Jul 10 '14 at 12:08

Perhaps it wouldn't turn into anything. From "Harry Potter and the Prisoner of Azkaban":

So the boggart sitting in the darkness within has not yet assumed a form. He does not yet know what will frighten the person on the other side of the door. Nobody knows what a boggart looks like when he is alone, but when I let him out, he will immediately become whatever each of us most fears.

-Professor Lupin

It is safe to assume then if one did not fear anything the boggart would not change at all. You would know what a boggart's true form looks like.

Another idea is that the boggart would just guess what to turn in to, because as Hermione says:

It can take the shape of whatever it thinks will frighten us most.

This wouldn't scare the person of course but it might be rather funny...

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Actually Mad-Eye moody knows what a boggart looks like normally. – CandiedMango Jul 10 '14 at 8:11
@Simon, and he didn't tell anyone; more importantly, he didn't tell us damnit! :) – Mac Cooper Jul 10 '14 at 11:51

When children learn to bear with Bogarts they make them change to funny things, so it's feasible to supose that a Bogart facing a totally fearless character (suposing that's possible) will probably switch to any form he can get from their "victim's" mind and it can be related someway to fear.

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They appear to have no form... Therefore, if there is no fear for them to transform into they will probably not even materialize or attempt to. Like dementors, they appear to feed off of emotions, so if there isn't something for them to feed off of, they will either leave or stay hidden.

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