|Age||7 years (Monica's Gang); 15 years (Monica Teen)|
|Likes||Samson, Red dresses, Jimmy Five|
|Dislikes||Puns with her|
Monica is the first main character who was created in 1963. She was a Brazilian 7-year-old child within a useful bravery. If a bothersome mind or Jimmy Five was provoking her (as Samson was easily snatched and stolen), she was able to hit and smack both Jimmy Five and Smudge with Samson.
Monica tends to be very angry, especially with Smudge and Jimmy Five, but most of the time, She is very kind and protective of her friends. With Maggie, her best friend, She is always happy and cheerful. She usually falls in love with some boys in Lemon District. Until, for any motif, she can't stay with him, and then the love ends, because of Jimmy Five, who is her true love.
Monica appears with a red blouse and has no shoes. She has Samson with her at all appearances. Her hairdo is black and strappy and appears with buckteeth, although some people called her toothy.
- Monica was based on Mauricio's daughter, also named Monica.
- Monica's buckteeth are similar to Bucky's buckteeth.