|First appearance||Lost Treasure of the Emerald Eye|
|Residence||New Mouse City|
Geronimo Stilton or OOG (code name) is the main protagonist that appears in all of the books, and is apparently also the writer of the books, as the books are all written from his point of view. He currently lives in New Mouse City, and is the editor of "The Rodent's Gazette". He is brainy, but a "scaredy-mouse" as he says in the books. He has several friends and has a sister name Thea, two cousins named Trap and Dino, a nephew named Benjamin,a grandfather named William and more.His sister Thea is a very adventurous mouse, but Geronimo is not. He is not a "sports mouse", either.
Geronimo Stilton is the publisher of The Rodent's Gazette, Mouse Island's most famouse newspaper. In his spare time, Mr. Stilton enjoys collecting antique cheese rinds, playing golf, and telling stories to his nephew Benjamin. He lives in New Mouse City, Mouse Island.
Personality EditGeronimo refers to himself as a "scaredy-mouse", as he is easily frightened, but he tries not to show it. He is shown to dislike outdoor events, such as adventuring and travelling, and anything that involves a large amount of exercise, and he dislikes sports for the same reasons.
However, he can also be brave at times, like at the Creepyfur castle, when he encounters the frightening things inside. He is also kind, and has a pure heart, proved when he weighted his heart and it showed to be lighter than a feather. He can make up his lack of physical strength with his mind.
- He appears in all the books.
Geronimo is a mouse with big ears and a quite small nose. His body color is brown, with patches of white under his feet and on his chest, continuing up to his mouth. He mainly wears a dark-green suit with a red tie, and light-green buttoned shirt underneath with lighter green trousers and glasses. He also wears glasses, which look like "glass butterflies", as mentioned in the World of Fantasy books
- He appeared differently in The Wild, Wild West and the future books.
- He wears his uniform most of the time.
- He is a scaredy-mouse.
- He doesn't like adventuring.
- He doesn't like traveling.
- He does not know how to tell jokes.
- He has a crush on Petunia Pretty Paws.
- He likes cheese, a trait he shares with his cousin, Trap.