Autistic, nr. Djupt inåtvänd och gränsöverskridande mentalt sjuk, absolut.
Denna intervju i Guardian med den riktiga Jon Ronson (som skrev filmen) ger oss en ganska solid utvärdering av "Frank's" mentala tillstånd:
"The moment the head is placed the change occurs. Not merely a change in attitude or outlook but a journey from one person to the other. I completely believe that Chris was born as two people." Middles likens Chris to transgender people, trapped in the wrong body.
och det finns lite extra information på den här BBC-intervjun som föreslår att "head thing" var mer än bara en handling
So to what extent was Frank Sidebottom just an act, a part Chris was playing? Or did it become an alter ego, a completely different persona? "You've got to be careful not to psychoanalyse him too much because it might be wrong," Jon Ronson cautions.
"But my feeling is that if Chris was incredibly chaotic and Frank was incredibly innocent, there's got to be a reason for that, right? "And to encase yourself in this fake head… there has to be a reason. It was safer. Frank was a calmer, safer place to be than Chris."