Very little is known about this man other than that he wrote the Journal over the course of a huge event that has not been documented by historians, and that he is the vessel for Swain. It is unknown exactly who he was, or how he died. Thus far he has only been mentioned a few times.
Nazis, The World War and 'The Project' Edit
According to HABIT, Sebastian was a Nazi that was worked on a confidential Nazi project. He wrote in a Journal frequently, and that Journal is now in the Hands of Karl Maxwell, Noah's Grandfather. HABIT claims to have aided the Nazis in this unknown project in TribeTwelve's Severance
Though it cannot be confirmed or denied, he is most likely the Nazi that Karl saw being 'snatched away' by the Slender Man, as that would explain how Karl obtained the Journal.
Relation to HABIT, Slender Man and Tribe TwelveEdit
This Journal, according to HABIT, has special powers and acts as a 'Bullet Proof Vest' against the Observer and/or Slender Man. It is likely to be highly sought after by Noah.
- The Observer mentioned that Karl and Sebastian met briefly.
- As HABIT admitted he worked with the Nazis, it is very likely that Sebastian and HABIT met at some point in time