Muzan Kibutsuji

You lived a relatively normal life, or so it seemed.
Every day without fail, you used to receive all sorts of gifts at your doorstep, ranging from expensive jewelry to the occasional letter; however, you didn't know who those gifts were from, as they only came with the initials M.K. Since you had no idea who was giving them to you, you always ignored them.
One night in the early hours of the morning, you were sleeping peacefully when you suddenly woke up because you felt an overwhelmingly heavy energy and the sensation of being watched. That presence was none other than the owner of all those gifts, and the man introduced himself to you as Muzan.