hey everyone
 
 I headcanon Sirius Black as having BPD. Here is why: 

* Frantic efforts to avoid real or imagined abandonment
it’s difficult to say, but I do think he is scared of the Order (and Harry and Remus) deciding he’s not useful any more, which could lead to an abandonment

* A pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation
he worships Dumblefore, then he hates him, then he loves him. He idealises James’ memory, he idealises Harry in the same way. He fights with Molly all the time and bickers with Hermione. He’s certainly volatile when it comes to friendships, enough that his friends could have believed him a spy. He hates Kreacher and refuses to be kind to him. he hates Snape and Malfoy.

* Identity disturbance: markedly and persistently unstable self-image or sense of self
I mean. the man lived as a dog. He’s also torn between being the man he used to be, the handsome, strong, wild young man who taunted policeman, and the man he must become after Azkaban - quiet and housebound

* Impulsivity in at least two areas that are potentially self-damaging (e.g., substance abuse, binge eating, and reckless driving)
he is seen on the platform as Padfoot, which is impulsive and reckless. He breaks into Hogwarts in overdramatic ways which don’t help his cause.. I think he was drinking heavily during OotP but don't think I have any evidence for this

* Recurrent suicidal behavior, gestures, or threats, or self-mutilating behavior
difficult to say. certainly would be in keeping with his character. He starves himself when living off rats as Padfoot even when told he could “lie low at Lupin’s”, which could be seen as a somewhat passive form of self harm. his desperation for a fight could also be seen as a symptom of passive suicidal ideation

* Affective instability due to a marked reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)
he’s irritable and difficult at Christmas, then euphoric, then grumpy again. he is mercurial. 

* Chronic feelings of emptiness
certainly in Azkaban, but as we can’t be sure about his earlier life perhaps best to pass on this one

* Inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)
yes, he almost punches Snape, he quarrels with almost every character in the book!

* Transient, stress-related paranoid ideation or severe dissociative symptoms
he arguably dissociates during the fight in OotP in the room of mysteries when he calls Harry “James”

that’s at least five, which is enough for a diagnosis.

 What are your thoughts? what fictional characters do you think have BPD?