Kooky, zany, meh. -examining fingernails in a dismissive manner- ...I think, in fact, the correct term would be awesome.
Buuuuuut marginally more seriously. This thread makes a good point. I have a suspicion said "kookiness" may be a province of sp-last 4w3's; a [confirmed] INFP 4w3 so/sx of my acquaintance has a veryvery similar feel. Though perhaps the kookiness seems more atypical in INFJs as INFPs are a bit more kinda...sparky/random anyway?
And I relate to Starry's observation that INFJs of this variety can very much turn the kookiness on/off. Yup, certainly feels that way here. Which is simultaneously cool and...kinda trippy...-eyes self in a suspicious manner..-...o.o...
ALSO, another random thought! Could it be related to having 7 in the tritype??
-..reading over post- ...Meh, I sound retarded today. My excuse is that I'm ill. <.<