I might as well. I haven't paid as much attention to Katy Perry as I have to Taylor Swift. My impressions of her are based a lot on her aesthetic choices, and what I've seen covered in gossip magazines lol. I'd be interested to get your opinion if you come across something interesting.This is just awesome. I think the same.
I should watch some Katy Perry interviews to be able to type her. I always thought ISTP from her videos. Don't you think she Katy Perry is playing Ne/Ti but is actually Se/Ti? She plays Ne-woman awkwardness and occasionally Se spontaneousness I feel making her according to your theory Se+Ti.
I should watch some interviews first though.