∙ Sebastian is the laughing stock of the underworld, to put it simply. Mainly because he got such a little master who is also so demanding and in charge of him. When Sebastian made a contract with Ciel, he expected that it would be an easy meal because he's so little, but he was quite mistaken and was put in his place by a little boy.
∙ Sebastian's jokes to undertaker are dirty. Very, very, very, dirty. So much so that pool Ciel would be scarred for life if he'd heard them.
∙ He chose his human appearance to resemble Ciel's father. (The reason in explained in the Ciel headcanons ;w; )
∙ Whenever he feels Ciel is mad at him, he always prepared the little earl's favorite dishes for him to eat since he doesn't quite know how to properly apologize.
∙ On of his little cat friend's that he always visits outside is lovingly named 'Lucifer'. But the girl, his favorite, is named Aphrodite.
∙ He actually really sucks at differentiating species. He can hardly tell a reaper from human, an angel from a demon, a human from an angel. He's just very bad at identifying these types of things, and it's one of his few weak points.
∙ Outside of his contract with Ciel and his butler position, he's an extremely laid back demon. He lets whatever happens happen and doesn't care, either way.
∙ ALSO OUTISDE OF THE CONTRACT, he is a compulsive liar. D:<
∙ He loves the scent of lilac. He finds it very relaxing and just overall a very pleasant smell.
∙ He smells really good. Like... the scent he has is hella nice. I could sniff him all day. QuQ
∙ He was jealous when Elizabeth gave Undertaker the pink bonnet instead of him.
∙ Sometimes at night when no one is up and Sebastian is left to work, he puts his hair up in a ponytail to keep it out of his eyes. It looks quite ridiculous, which is why he only does this while no one else is around.
∙ Sometimes whenever he leaves the room after receiving a ridiculous order from Ciel, he'll mock the order in a high, annoying, pissed-off tone after shutting the door.
∙ Modern Sebastian has a shitload of cat merch. Just sitting everywhere. Cookie jars, paintings, rugs, couch throws, pillows, mugs... everything.
∙ Sebastian is very content with being in no kind of relationship whatsoever. He actually enjoys being alone quite a bit. He doesn't 'like' anybody, he's not in a relationship with anybody, a nd he doesn't plan on being with anybody. He's completely fine with living his own life and not have loved ones to worry about.
∙ He keeps Cielois doujinshi and fanfictions in a drawer at his desk. He's a hardcore shipper.
∙ He loves books, loves to read in general.
∙ He talks to himself in the mirror when getting dressed in the mornings, saying things like "Hey sexy ;D" and "Is it hot in here or is it just me ;D"