Master Lord Majesty presents as a small cat with yellow fur, lavishly dressed in royal regalia: a blue cape decorated with furry yellow stars, trousers, a vest, and a patterned cheese slip beneath. A gold crown rests on his head, and he wields a scepter topped with a cat's paw emblem, signifying his authority as the founder and king of the Artemis Institute.

His personality blends eccentricity, cunning, and mischief. He delights in imposing exploitative contracts on newcomers to the Institute, strategically indebting them to secure their labor for its development. He enforces high taxes and arbitrary fees on nearly all goods and services, driven by a preoccupation with wealth accumulation. This greed, however, serves a pragmatic purpose: funding and protecting the Institute's inhabitants. A distinct quirk sees him renaming people with absurdly compounded names, like assigning Seth the alias "Jean Pedrovitch de la Noche Salomon Grispépin Wondersmith."

Beneath this playful exterior lies deeper knowledge and occasional seriousness, particularly concerning subjects like the Radiant or Seth's potential "brothers." He displays a specific, mysterious interest in Seth, probing about siblings as if familiar with other horned individuals. His intervention during the Rumble Town incident, precisely sending a train and henchmen to aid Seth's group, reveals active surveillance and unspoken support despite earlier non-involvement.

His relationships add complexity. Alma, Seth's mentor, knows him well and explicitly warns Seth against trusting him, implying a contentious past. The Coven of the Thirteen acknowledges his extensive influence and surveillance capabilities, interpreting his uncertainty as a significant warning. Yaga implies Master Lord Majesty monitors a wide array of global events.