- For the character's inspiration from standard continuity, see Johnny (Hang in There, Scooby-Doo).
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* Physical appearance.
Dr. Jonathan Jacobo is a former scientist who dressed up like the Pterodactyl Ghost to pull off bank robberies for his experiments to create real monsters.
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His basically your stereotypical mad scientist who plotted to embrasses and destroy Mystery Inc through a smear campaign against the gang, reanimating there of classics villains and donning various disguises
Scooby-Doo 2: Monsters Unleashed
Years later, he enacted an more complex plan involving the recreation of Scooby's previous monster enemies. Taking on the guise of both Heather Jasper Howe and the Evil Masked Figure, his goal was to discredit Mystery Inc. and eventually destroy them (with the help of Ned). He pinned it all on Old Man Wickles and framed him by putting the Black Knight Ghost and the monster book in his mansion. His plan was foiled when Scooby outwitted his monsters and used the control panel to destroy them. Jonathan and Ned were later taken to prison.
Jacobo: So long, suckers! (glider begins to brake) Agh! Help me, suckers!
Jacobo: I would have gotten away with it... if it weren't for those meddling punks, and their dumb dog!
- The original Pterodactyl Ghost in The Scooby-Doo Show was Johnny, who operated a delivery truck, and his criminal activity was about bootleg cassette tapes, not bank robbery. This is such a significant continuity difference that Jonathan Jacobo should probably be regarded as a different character than Johnny, either an AU version or a second criminal who used a Pterodactyl disguise.
Although at the end it's revealed that Jacobo wore a female mask whilst being Heather Jasper Howe, there is a popular idea is that the mad doctor created and used some potions to give himself the a appearance of Heather Jasper Howe before creating the mask.
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