Aoki serves as the Yotsuba family's fourth butler and handles their finances. He's the type who carries himself like a lawyer rather than a typical butler—sharp, composed, and clearly in his prime. Fans often note his shrewdness and no-nonsense demeanor.
What's interesting about Aoki is his inconsistent treatment of the family. He's unfailingly respectful toward Miyuki, but when it comes to her brother Tatsuya, he basically treats him as just another servant. He'll outright ignore him or be deliberately rude, which understandably gets under Miyuki's skin. His disdain for Tatsuya is pretty blatant, and it highlights the weird family dynamics at play in the Yotsuba household.
Content compiled by AnimeList.moe from publicly available sources.
