Grigri's initial motive is to raid any places on finding any candy that he and the Mascrapules can eat. However, Les Pyjamasques are always here to thwart their plans from getting away with it.
As of "L'école des Pyjamasques", Grigri's motive is to try and let Les Mascrapules stop Les Pyjamasques from getting the credit by competing against the group.
He can shrink into a size of a rat.
He can use his teeth to eat through material.
Grigri is shown to have the opposite behavior of Yoyo, such as showing jealousy, getting into fights towards Les Pyjamasques. At occasions, he will get along with Les Pyjamasques and will work together with the group.
In his first appearance, he acted less envious towards Les Pyjamasques.
Grigri wears a grey one-piece suit resembling a rat with ears and a tail. The costume leaves an opening for the lower portion of his face.
In his first appearance, his eyes gray in color instead of brown, and he lacks eyebrows.