User blog:YouDontKnowSponge/SML Theory: Jeffy is an imaginary figment of Mario's paranoia

Most of us know how Mario started off with an abusive relationship with Peach.

To think of it, Peach and Jeffy both treat Mario in similar ways. Both beg off him to get what they want.

Mario could have imagined up Jeffy through fear and anxiety as he was still suffering Peach's break-up.

He is hallucinating any interactions (including Rosalina) Jeffy has with other characters. All his failure adventures with Jeffy are also mostly hallucinations.

Junior could have simply imagined up Jeffy when he saw Mario having one of his "Jeffy" break outs to explain why he appears in Junior videos. Brooklyn Guy is just playing along with Mario to make it look like this is normal.

In reality, Rosalina was trying to snap Mario out of believing Jeffy but Mario hallucinated it as her defending Jeffy. No ordinary mother would defend a child with such behavior.

In Ghost Jeffy!, Mario was teaching his brother how to "see" Jeffy.