Description
Luxembourg presents as a young man with short light brown hair and long bangs covering his right eye. His typical attire is a formal dress suit with a ribbon tie, black gloves, and shoes; alternative designs feature a blue pinstripe shirt, white vest, black tie, tall dark boots, and khaki pants. Early draft concepts showed him with Netherlands-like shorter hair or as a precocious boy in expensive clothing, though these designs were unused.

He exhibits an elegant, polite demeanor and speaks formally, though he occasionally slips into the Kanazawa dialect when speaking to himself. Burdened by heavy workloads, he missed the 2011 Halloween event due to obligations from his boss. The following year, leveraging Hollywood connections, he attended the Halloween party in a wolfman costume, won the contest, and took pride in frightening Belgium. A notable trivia identifies him as the world’s top drinker. He owns a dog named Pelutze, included due to Luxembourg's association with numerous dog-featuring films. Initial notes describe him possessing clear common sense.

Luxembourg affectionately calls Belgium "Big sis," acknowledging her consistent care; she views him as a reliable younger brother. During the 2013 Halloween event, he intentionally scared her in his wolfman costume, causing her to faint—an outcome he found amusing. He similarly uses "Big Brother" for the Netherlands as an endearment. Netherlands advises Luxembourg not to follow his example, though Luxembourg admires the fine arts in Netherlands' home. Early notes suggested Belgium would be frequently occupied by interactions with both Netherlands and Luxembourg. Draft sketches depicted Belgium embracing him or Luxembourg attempting to mimic Netherlands' hairstyle.

His background includes an off-panel mention during the Christmas 2007 event, where Finland referenced Luxembourg’s historically prominent family lineage, comparable to the Habsburgs. His first official appearance occurred during the Halloween 2011 manga event, though his face remained unseen; occupied with work, he regretted missing the festivities but resolved to attend next year after seeing a group costume photo of his siblings. Later, during the Christmas 2011 event, he checked on Belgium as she experienced a nightmare involving his scrapped design. His formal, visible debut was in the Halloween 2013 manga event, winning the costume contest in his wolfman disguise.

In the anime continuity, he first appeared in a non-speaking background cameo in *Hetalia: World Stars* episode 1 ("The Weirdos - Part 1") and later in episode 11 ("Spa Battle and Spain's Kitchen"). His proper speaking debut occurred in the OVA "Belgium, Luxembourg, the Netherlands and 'That' Dog," adapting interactions involving his relationships with Belgium, Netherlands, and Pelutze.