Sebas Tian serves as head butler of the Great Tomb of Nazarick, commanding multiple manservants and butlers. Created by the Supreme Being Touch Me, he presents as an elderly man with immaculate white hair and beard, clad in a traditional black butler uniform. Visible wrinkles suggest gentleness, yet his eyes remain piercingly sharp. He possesses an unyielding code of justice inherited from Touch Me. Unlike most Nazarick denizens, he refrains from universal hatred or disdain for humans. He champions the strong's duty to protect the weak, evidenced by rescuing Tuare. However, he exhibits disgust toward morally corrupt humans and eliminates Nazarick threats without hesitation. This moral stance sparks friction with figures like Demiurge. Internally, he grapples with actions potentially diverging from his master Ainz Ooal Gown's directives, harboring profound anxiety over perceived disloyalty. Originally part of Nazarick's final defense on the 9th Floor alongside the Pleiades Six Stars, his role was to delay intruders for guild members' last stand preparations. Though not a Floor Guardian, his combat prowess rivals theirs. After Nazarick's transition to the New World, his duties expanded to reconnaissance. On such missions, he explicitly forbade subordinate Solution Epsilon from indiscriminately consuming humans unless they posed direct threats. He gathered intelligence in human settlements like the Re-Estize Kingdom, documenting information from adventurer guild boards and street gossip for Nazarick reports. Following the Sorcerer Kingdom's establishment, his responsibilities shifted to operations centered in E-Rantel. Within the crossover context, Sebas Tian appears in a school setting working alongside Wilhelm van Astrea (*Re:Zero*) as part of the groundskeeping staff, maintaining the courtyard. The butlers converse about mentorship and personal relationships, reflecting on their experiences. During a Valentine's Day event, he identifies Petelgeuse Romanee-Conti as an intruder in the school kitchen and forcibly removes him. His diminutive form retains distinctive elderly features, including the sharp eyes noted originally.