Thumper

Thumper is the tertiary antagonist in A Bug's Life. He is Hopper's "pet", so to speak.

Biography
Thumper first appeared at the beginning of the film with the other grasshoppers, held on a leash. In order to maintain control over the ants, Hopper captures Dot, the Queen's daughter and Princess Atta's little sister, and brings her really close to Thumper, who was snarling and growling. Then the film's protagonist, Flik, yells at Hopper to let her go. Hopper's response is to double the food order before flying off with the other grasshoppers.

Thumper was later seen at the grasshoppers' home, laughing with the other grasshoppers when Hopper expressed concern about Flik standing up to him. Hopper then killed three grasshoppers and told the others that the ants out numbered them 100 to 1, and that they are going back to keep them in line. Thumper and the grasshoppers then flew to the ant hill.

When Hoper was dissatisfied with the food, he orders that every scrap of food on the island be given to him, and Thumper is shown growling at the ants. When Dot goes to find Flik, Thumper finds her and chases her until she falls off a rock (which, to the ants, is a cliff) to her supposed death. Thumper then flew away, only for Dot to emerge, flying for the first time.

Thumper is shown growling at Manny the Mantis when he tries to do a circus act on the Queen, but Hopper told him not to. Then a model bird the ants made is unleashed, scaring the grasshoppers, only for P.T. Flea to set it on fire. When it is revealed it was Flik's idea to build the bird, Hopper orders Thumper to beat him up. When the ants revolt, Thumper tries to scare Dot one last time, only to be slapped in the face by her and is then scared off by Dim the rhinoceros beetle.