One useful fan theory states that the entire plot is just Neon Genesis Evangelion boiled down to six episodes and served hyperactive on a bed of heartwarming comedy. It's a deconstruction of a deconstruction, with the Mind Screw left intact, and not a single phallic symbol removed.
tvtropes.org/pmwiki/pmwiki.php/Anime/FLCL

Через показ двойного кризиса, отдельных людей и общества в целом, Анно использует события Евангелиона Нового Поколения, чтобы запечатлеть смятение и разочарование, царящие в Японии во время кризиса 90-х годов.
Laura Montero Plata, The Crisis of the Self in Neon Genesis Evangelion, Kinema Club Conference for Film and Moving Images from Japan XIII at Reischauer Institute, Harvard University, 2014.