Kujack Jack (クジャック・ジャック Kujakku Jakku), also simply known as Jack, is a peacock-like Tamagotchi who first appeared in Episode 7 of Tamagotchi! Yume Kira Dream. He makes minor appearances in the anime, usually with Tropicatchi. He acts more like an animal than most Tamagotchis and can't speak. Not much is known about him.
Kujack Jack has the appearance of a peacock. He has green, dark green and orange feathers and a blue, yellow and green body. Kujack Jack also has dark round eyes, a pink beak, and pink feet.
Kujack Jack is known as a very fashionable Tamagotchi character, being a peacock. He likes very stylish hairstyles and is loved by Tropicatchi. Jack is a very hard Tamagotchi to approach as he tends to run away very quickly. He likes food and sometimes will eat anything, even flowers.
Kujack Jack is a combination of the Japanese word kujaku (孔雀), meaning peacock, and the male given name Jack. Jack may be part of his name because in Japanese it is pronounced as jakku, which sounds like part of kujaku.