|Anime debut||Yu-Gi-Oh! VRAINS episode 3: "Contact"|
Roboppi (ロボッピ Roboppi) is a character appearing in the Yu-Gi-Oh! VRAINS anime. It is initially introduced as a robot working as a maid at Yusaku Fujiki's house, before interaction with Ai allowed it to develop free will. In doing so, they developed a brotherly relationship with Ai.
Roboppi is a small robot, not even knee-high to Yusaku. It has a spherical baby blue head with a black screen for a face with yellow rectangular eyes and "horns" that curve around the sides of its head with orange tips and pink bands. The baby blue body is roughly triangular; widening as it reaches the floor, and has a dark blue band surrounding its wheels, with a white pouch. Its small arms are tipped with pink hands consisting of a thumb and palm.
In its human form, Roboppi has the appearance of a small boy with yellow eyes, and has baby-blue hair with an orange underlayer in a style resembling his robot form, with pink wicks on the "horns" of hair. Like Ai, Roboppi has a diamond shape at his throat and back—a yellow one. After hijacking a waiter SOLtiS, Roboppi wears a white shirt with a black bowtie, a charcoal waistcoat, and black pants and charcoal shoes. In digital worlds, Roboppi dresses casually in baggy clothes in a similar color scheme to his former body: a blue hoodie with a black chest, a white collar with a black line running across the circumference, red forearms (similar to the robot form's pink hands) and gold cuffs, a yellow undershirt, light blue pants with the left pocket lined with a red and white strip, and white shoes.
Roboppi was first seen cleaning Yusaku's bedroom. Ai called it an idiot; Roboppi replied that "idiot" was a forbidden word. Ai asked Roboppi if it wanted to be smarter.
Roboppi uses an "Appliancer" Deck, the focus of which is to co-link "Appliancer Celtopus" with Link 1 "Appliancer" Link Monsters to increase their ATK, as well as to use the co-link effects of said Link 1 Link Monsters.