In the anime Demashita! Powerpuff Girls Z, Grubber is a member of the Gangreen Gang, a group of green-skinned teenage delinquents who are recurring antagonists. Within the gang, which consists of leader Ace, Snake, Big Billy, and Lil Arturo, Grubber stands out as the most peculiar and chaotic member. While the original American character is known for blowing raspberries, this anime version primarily communicates through odd grunts and other unintelligible vocal noises, though he is capable of speaking while in disguise. His physical appearance is a notable departure from his counterpart in the original series; he has a less grotesque design with normal, non-protruding eyes that are distinctly purple, an actual belt instead of a rope, and an always-visible pink tongue. He wears shoes and standard clothing, and his skin is a darker shade of green compared to the original Gangreen Gang.

Grubber's background is that he was once an ordinary teenager living in Tokyo until he was exposed to Chemical Z, a mysterious substance that mutated him and his friends into their green-skinned forms. Unlike some other villains, he retains his human intelligence but also a juvenile, troublemaking personality. His primary motivation is simple mischief, joining his fellow gang members in acts of vandalism, pranks, graffiti, and petty crime. They are not typically driven by grand schemes for world domination, but rather by a desire to cause trouble and assert themselves as bullies, often clashing with the Powerpuff Girls Z when their activities cross the line.

One of Grubber's most defining traits in this series is his unique shape-shifting ability. By twisting his hair, he can physically transform his body into a perfect likeness of any person he wants to impersonate. However, this disguise has a critical and comedic flaw that he cannot overcome. Even after transforming, he retains his green skin, purple eyes, and the tongue perpetually sticking out of his mouth. This makes his disguises laughably ineffective, as most people can easily see through them. The notable exception to this is the general public of Tokyo, who often fail to notice these obvious green-skinned impostors; only the Powerpuff Girls Z themselves seem to be consistently un-fooled by his transformations. While disguised, he is able to speak more clearly than usual, though he remains clumsy and foolish in his impersonations.

Grubber's role in the story is that of a supporting villain and a member of an ensemble. He does not usually act alone but is always seen alongside his fellow gang members, contributing his odd physicality and failed disguises to their antics. His relationships within the gang are not deeply explored individually, but he functions as an integral part of their group dynamic, which is portrayed as a parody of a juvenile street gang. The Gangreen Gang is generally considered to be among the weakest of the villains the Powerpuff Girls face, often serving as a source of comedic conflict rather than a serious threat. The anime also gives a glimpse into his personal life, showing that he lives with his father, who bears a striking resemblance to him and shares the same unusual speech patterns and mannerisms, suggesting these traits are genetic or learned within his family. This focus on the characters' home lives is a distinctive element of Powerpuff Girls Z. Over the course of the series, Grubber does not undergo significant personal development; he remains a consistently comic and bizarre member of the gang, defined by his failed attempts at deception and his strange, quasi-mute personality. In terms of abilities, beyond his shape-shifting, Grubber does not possess any superhuman strength or energy-based attacks. His primary value to the Gangreen Gang is his oddness and the chaotic, unpredictable nature of his poorly executed plans, which often provide the comedic foundation for the group's encounters with the heroines.