Sebasstian

Sebasstian (サバスチャン, Sabasuchan) is the secondary butler of Neptune royal family.

Personality
Sebasstian takes his duties as a butler very seriously and is generally polite but also a bit strict. He takes great pride in his job and is quick to get upset when things don't go as planned, although he also shows gratitude to those who help him.

Although Sebasstian is polite, like Flounnder, he can be very selfish, as he always puts his personal disadvantages first when faced with a problem, even when others' lives are in danger. This is clearly seen when he was immediately concerned about his job, after Mero's "kidnapping" by Octo, to which Kimihito angrily reminded him that this was secondary given the potential danger Mero was in.

Trivia

 * Sabasstian's name derives from the butler Sebastian from the popular anime adaptation of Johanna Spyri's Heidi. Ever since, in Japanese popular culture "Sebastian" has become a stereotypical butler name, similarly to "Jeeves" in English culture.
 * His name is also a pun on "mackerel" (鯖).
 * In the official translation his name is spelt "Sebasstian"
 * Besides that, in the manga and anime by Yana Toboso is a butler called Sebastian. in one of the files where they discuss oct, you can see their visions of how they would look as handsome butler mermen, as they put it. One of the visions has a striking resemblence to Sebastian by Yana Toboso. I feel as if that might be a reference. The other butler as shown in the image looks a lot like a butler names Claude, also from Black butler.
 * Sebasstian, along with Flounnder and Wladislaus, is one of the few male Liminal characters in the manga series.