Yeah … Pinkies is I'm unsure as she has in the early eps shown to seem to have a very loose grip on her sanity if you go with the ep '' party of one'' its shown she seems to be kinda unstable or something basing it on this scene
https://www.youtube.com/watch?v=DiVzkWnJ_F8 as you can see she seems to as that scene goes on starts at first just imagining the items as real but she quickly seems to go into a mental break
Twilight well she has a variety pf problems in the early seasons that seem to get worked out for the most part over the seasons from herself putting less importance put on varies more or less trivial matters that in the grand scheme of things aren't that important