Ropen Lopen is one of Sir Raleigh's oldest pets seen in "Tide of Terror" of Sly Cooper and the Thievius Raccoonus.

It is an Occular Glowium which, based on its appearance, is a glowing eyeball with tentacles. Ropen Lopen resides inside Raleigh's ship graveyard, as seen during the job "The Gunboat Graveyard." He was seen floating up and down inside a large container of water located high above the ground level. Sly Cooper snuck around the ledge of Ropen's container as he explored the ship graveyard in search of a treasure key.

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