Knighttchi, potentially recognized under alternate names like "Night," is a male adult Tamagotchi with a gray head and body, blue eyes, and a silver knight helmet adorned by a gold star and red plume, complemented by a matching red cape. His personality embodies chivalry and passionate heroism, often manifesting in exuberant or exaggerated conduct. Within "Tamagotchi! Yume Kira Dream," he attends dance lessons in Dream Town alongside peers such as Yumemitchi and Kiraritchi, driven by aspirations to become a male idol. He further performs as the pianist for the Rainboys music band.

His background includes participation in the anime film "GO-GO Tamagotchi!" episode "Who is Lovelin's Partner?" where he competes as a finalist in Lovelin's contest. During a dance sequence, he nearly tumbles offstage but is rescued by Himespetchi disguised as Himeboytchi.

Beyond animation, Knighttchi appears across multiple Tamagotchi virtual pets. On the Tamagotchi P's, he evolves from Cosmotchi under specific conditions: two or fewer Care Mistakes alongside Style, Charisma, and Gourmet training. On Tamagotchi Friends, he evolves from male teens under perfect care and Gourmet personality training. He also features in later models including m!x, Meets, Pix, and Uni. In the Uni, he serves as an NPC at DoriTama School, engaging in dance and singing activities during Mr. Micchi's Performance Class.

Spin-off iterations include "Hakubatchi" (via the CIAO Tama Deco Pierce) and "Saint Knighttchi" (via the Royal Change! Pierce), both altering his visual design while retaining core traits. He appears as a customer in the 2025 game *Tamagotchi Plaza*, frequenting the Bicycle Shop and Glasses Galette Shop.