Nikki is a member of Garlic Jr.'s Demon Clan and appears as one of his three primary henchmen in Dragon Ball Z: Dead Zone. He has a tall build, blue skin, and white hair, and his Japanese name is a pun on the word for cinnamon. Nikki displays a notable fondness for fruit, particularly apples, which is shown when he and the other minions kidnap Son Gohan and he stuffs several apples into his mouth.

After Gohan is taken to Garlic Jr.'s palace, Nikki is assigned to watch over the boy. This proves to be a frustrating task because Gohan eats a piece of fruit from a tree in the courtyard, becomes intoxicated and delusional, and runs wild, forcing Nikki to chase him. Nikki's primary motivation is loyalty to Garlic Jr., assisting his master's goal of collecting the Dragon Balls to achieve immortality.

When Son Goku arrives to rescue Gohan, Nikki prepares to fight alongside his fellow henchmen Ginger and Sansho. He uses a battle phrase that allows him to power up, increasing his size and speed, and he can fire energy waves from his hands. One of his notable abilities is pulling a sword from his leg, a technique he employs against Goku. During the battle, Goku uses the Power Pole to knock Nikki into a nearby tower, and Nikki is ultimately killed along with Ginger when Goku fires a Kamehameha that destroys them both.

Nikki's relationships are defined by his role as a subordinate to Garlic Jr. and his partnership with Ginger and Sansho. He has no significant character development beyond this single film, though he makes a brief cameo appearance in Dragon Ball Z: Fusion Reborn as one of many past villains who escape from Hell, rendered with an unusual coloring.