Can't think of anyone..maybe that jedi girl from the force awakens. she was just so impulsive and unlikable, no depth to her character. actually most characters who are actually typed as isfp are quite mellow (mistyped completely), there isn't much to like in a lot of them.
Tumblr users are quite annoying. Posting about mental illness does seem romanticised sometimes, but it probably comforts them that hundreds can relate to same post. The annoying posts are the ones that try and force beliefs on you. Those guilt tripping "stop scrolling" posts are gonna work on me. The feminist posts spammed on my dash a couple years ago, all these preachy posts about PC stuff. Like no one cares?? it has no effect on the real world whatsoever and no one is reading except people like you who are equally emotional and force about their beliefs as much as you. all it does it give the site a bad name. those types of tumblr users are probably NFs, idealistic, trying to be real world focused but it's really not. I eventually stopped following these blogs and it's so much better that way...rant over.