- "I am so tired of having to explain everything to you. You're supposed to be so very smart, and yet you always seem to forget about this! This is my knife. It is very sharp and very eager to hurt you, almost as eager as I am. If you don't do what I say, you will suffer bodily harm. Is that clear enough for you? Now, get in the damn jeep."
- —Stephano to the Baudelaires
According to this guise, "Stephano" was a member of the SSSSSS, the Scientific Society Seeking to Soothe Stress and Suffering, and was to become Dr Montgomery's herpetological assistant after the loss of his previous assistant Gustav Sebald.
He claims to be an Italian man.
When operating as Stephano, Count Olaf had powder applied to his ankle tattoo, shaved off his unibrow, and used a fake beard.
Using the venom of the Mamba du Mal, Count Olaf as Stephano killed Montgomery Montgomery. With the help of the Hook-Handed Man in the alias of Dr. O. Lucafont, Stephano pinned the blame on the Incredibly Deadly Viper. After the Baudelaires exposed the truth, Arthur Poe used a cloth to remove the powder from Count Olaf's ankle while Sunny removed the Hook-Handed Man's fake hands. Both of them managed to get away.
- His name is incorrectly listed as "Stefano" in some printings of The Austere Academy, depending on the version.
- In the book, while having dinner, under the table, he gently rubs the blade of his knife against Violet's knee for their entire meal.
- In the 2004 film, Stephano was depicted with hair and a thin moustache. Also instead of being exposed as Count Olaf, he managed to get away leaving a trail of his disguise leading to the open door.
- In the TV series, Monty asks Stephano where he studied herpetology, and Stephano replies that he does not know anything about sores. This is a joke about herpes.