Yuki Nagato is a quiet high school freshman that is the only member of the SOS Brigade that was not "voluntarily arrested," or coerced into joining, by Haruhi Suzumiya. When Haruhi claimed the empty Literature Club as the SOS Brigade's clubroom, Yuki was found reading there. Haruhi claimed the clubroom and Yuki as part of the Brigade, both of which she didn't mind. She lives alone in the same apartment complex as Ryoko Asakura. She wears glasses and her school uniform at all times, only discarding the former after Kyon babbled that she was cuter without them and that he wasn't a "glasses man," and the latter when the SOS Brigade went on vacation.

Primordial Demon Summoned by Rimuru. Abilities - Unique Skill - Great Wiseman, Tempter - Ex - Multiple Barrier, Spatial Transfer - Daily Skill - Magic Perception, Demon Lord's Haki - Battle Skill - Law Manipulation