Herb

Herb is a shapeshifter who could be classified as a "villain" or evil person; he loathes Herbert to the core and can't stand him. Herbert is a scientist striving to defeat death and also attempting to rule the world, much like Herb, who also seeks world domination.

Upon learning of Herbert's plan, Herb desires to murder him. Being a shapeshifter, he impersonates him, stealing his appearance, and even kills his superiors, capable of impersonating them as well, thus stealing their identity. He wears a casual blue collared shirt, a white scientist coat reaching his ankles but not dragging on the ground, brown pants, and dark-colored high-heeled shoes. He has brown hair and wears green glasses, similar to Herbert, but with a small red swirl on the right side of his chest.

Herb is selfish, cunning, and rude, often described as unpleasant to communicate with as he tends to make hurtful or insulting jokes, constantly taking advantage of people's vulnerabilities and emphasizing past mistakes. He is ambitious and hyperactive, and even with his incredible intelligence, he rarely genuinely considers the consequences of his actions, more concerned with the "present" than the "future," and he hardly forms attachments to anyone.

Herb is a cannibal, feeding on humans. He is quite obsessive and sadistic, jealous, and unwilling to share what is his, deriving pleasure from others' suffering.

Herb doesn't actually have a name; he stole it from Herbert.