The AI-powered English dictionary
plural otakukin
(dated, Internet, sometimes capitalized) A person who claims or believes that their soul is a reincarnation or parallel incarnation of a fictional character (especially, from anime, manga, or video games). quotations examples
The definition of entertainingly nutty would be otakukin.
2006, Cypher, “Considering Snuhwolf”, in alt.horror.werewolves (Usenet)
I pointed out that you telling me that Otakukin are insane made as much sense as belief in God. Both are things taken on faith, you see?
2007, Juan Valdez, “Ping Juan Valdez”, in alt.recovery.aa (Usenet)