A lodger.
Absolute horror show. Brought danger to my door with various sexual partners, put themselves in danger repeatedly, turned up on various TV things with an entirely different name and identity depending upon whatever the TV thing was about, eventually found subscriber based online sites and makes a bloody good living with constant fawning and praise from randoms as a result of all their heavily monetised disasters, accidents and awful circumstances mostly entirely self inflicted, treated rent as an optional extra and would get all teary when they were gently reminded that it was late. As if anything that had (or hadn't you never could tell) happened to them in the past made it OK to not pay the peppercorn rent they were being charged. And you don't say there's no money when you then casually mention 6 hours later than you've just booked flights to x country for the following weekend.
The most irritating 'disaster' SM event was the 'I was a victim of a ---phobic attack, sob, sob, I have no money because she stole from me' that led to a fuckton of donations - when they actually threatened some girl in a club with cutting her face for rolling her eyes and walking away from where they were holding court - and the girl turned out to be very well able to defend herself. Oh, and only the day before, I'd overheard them subjecting DP to homophobic abuse because he 'wasn't manly enough and should be wearing a dress and pinny'.
It was actually scary when I was going to tell them to make alternative arrangements because I was half expecting to have to call the police to get them out or have them announcing to people on SM that I was bullying them and my identity so I would be on the receiving end of abuse from randoms who had no idea what they were really like. However, thanks to the latest Poor Me post, somebody had offered them somewhere to stay to 'get away from the danger' and they were already packing when I knocked on their door and asked if we could talk.
I wasn't forgiven for accepting the last week's rent, though. But going by the thousands of people that are on their SM and the pathetic gushing praise about what an amazing, beautiful person they are, I'm sure they weren't short of cash for more than about five minutes.
After they left and I'd had to replace everything in the room that they'd contaminated with sweat and BO and clear tons of crap they'd left behind I decided that I'd rather risk homelessness than EVER have a lodger again. Just in case they also casually mentioned after they'd moved their shit in that they also had a BPD diagnosis and they'd jacked their employment in so they could now 'devote their energies into making the break into show business' - like that lodger did.
BPD without treatment/therapy definitely damages and harms people around the sufferer. It's what makes it so important to keep trying to manage the disorder - the cost to both the person and everybody around them.