Hi! I like your headcannons, and I was wondering (I dunno if someone already asked you this), how do you think was Sensei, his relationship with his sons and daughter, when they born, when they left him, what they did once he was dead. Once again, I love your headcannons, they make me feel happy (sometimes sad) Have a good day n.n
I have spent far too much time thinking about Sensei and everything tied to him, so let me just word vomit here for a moment on all of y’all.
I believe (and @haloud can back me up on this) that all the Servamps were once humans that Sensei discovered on the brink of death and turned into vampires, primarily because he took pity on them and wanted to give him a second chance at life. They were created in order of oldest to youngest (Kuro first, Lily last) and spaced fairly far apart. All of their names-their true names, I mean-and the sins tied to them related to the manner of their deaths. So like, for example, Gluttony died of starvation in a town ravaged by war, and when he was reborn became obsessed with food and became known as World End, just as his home had been destroyed.
For a long time, I think all of them did indeed act as a family, and they were close for a long time. Then, one by one, all the Servamps began to spread out, to seek Eves and form their own unique bonds in the world, and Sensei was left alone again.
That was when he set out to create Tsubaki, as a new child who would be much more reliant on him and he could have a companion in. And then C3 stepped in and Kuro killed him, and it all just went to shit man, just so fast.
All of them grieved, in their own ways. Kuro and Hyde shut off their emotions, World End and Wrath made peace with the fact the man they considered their father was dead, and Lily, Jeje, and Hugh all stood by the fact that no other soul should have to suffer their fate. They never got to choose to be an immortal it was thrust upon them, and a small part of them will always resent Sensei for that.
And then of course, Tsubaki was utterly devastated by it all and swore revenge on his siblings. There’s lots of pieces to this puzzle that are still missing, like how Sensei knew about vampires. Personally, I’m of the opinion that he was one of the original founders of C3, long before it was a vampire hunting organization. It changed somehow after he left and just-god, there’s so much we don’t know, please put me out of my misery.