Harvey Mercadoocasio, otherwise known by his nickname Harvo, is a former staff member at Archie Comics. He is a comic book inker and penciler who has worked on a number of Sonic the Hedgehog issues and its spin-offs.
- Sonic In Your Face!
- Sonic & Knuckles
- Sonic Triple Trouble
- Super Sonic vs. Hyper Knuckles
- Sonic & Knuckles: Mecha Madness Special
- Sonic Blast
- Knuckles' Chaotix
- Tails miniseries
- Knuckles miniseries
- Sonic Quest (assisted by Jay Oliveras).
- Sonic Super Special (excluding #5)
- Various issues of Sonic the Hedgehog.
- Various issues of Knuckles the Echidna.