Grinko is the keeper of the Herzen Museum and tells Professor Layton some valuable information about the Herzen Family's past and guides them around the Museum. Grinko kindly reveals Beluga's birth name to the team. however, Grinko is also employed by Beluga to search for the Elysian Box along with Sammy Thunder. He appears in the game Professor Layton and the Diabolical Box.
Grinko wears an orange jacket, teal sweater red trousers and black shoes. Grinko is one of the few character throughout the Professor Layton games with a beard.
Grinko gives the following puzzles in Professor Layton and the Diabolical Box:
"Grinko's main job is Herzen Museum curator, but his employer, Beluga, often sends him around town to sniff out leads on the Elysian Box. Grinko is one of the few people in town who fully comprehends many of the town's secrets."