- While working on Jonny Quest Real Adventures, Glenn Leopold created villains like Ezekiel Rage, twin daughters of Zin, and Elise.
- With Producer Davis Doi, Glenn Leopold developed the Hanna Barbera show "SWAT Kats" for Television.
- While working on The Smurfs as Story Editor/Writer, Glenn Leopold created characters like The Clockwork Smurf and Clockwork Smurfette. Glenn Leopold created Clockwork Smurf in Season 1 and Clockwork Smurfette in Season 7.
- Glenn Leopold is one of the co-creators of Grandpa Smurf (The Smurfs Season 6) and Nanny Smurf (mentioned in The Smurfs Season 6 and introduced in The Smurfs Season 8).
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