Ulbert's motive is to try and let Les Mascrapules stop Les Pyjamasques from getting the credit by competing against the group.
He can dig underground.
He can use his tail to attack opponents such as tripping or soiling their costume.
Ulbert is shown to have the opposite behavior of Gluglu, 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.
Ulbert wears a pink one-piece suit resembling a worm with a long tail. The costume leaves an opening for the lower portion of his face, and has a lump at his head that resembles of a worm's head.
In his first appearance, he lacks a lump at his head that resembles of a worm's head.