I can see bpd but not aspd, considering Dazai literally goes against the criteria for that one like 300 times in canon. They would both be projection but I think aspd is the most mischaracterizing considering you have to change core parts of his character to fit the label haha. So sick of lack of remorse immediately meaning sociopathy to people online please pick up a resource that isn't just a list of symptoms on the DSM. (Not @ anon just in general...)

My personal Dazai headcanon though. Enjoy