September was the ninth month of 2018.
- 1 September - ReBrick is merged into Lego Ideas.
- 2 September - Chris makes his first reference to Universe C-197, where Sonichu and other fictional characters exists. He also rambles on about his many variants.
- 11 September - Chris's Trespass after Forbidden hearing resumes, ending with a continuance for 25 September.
- 12 September - Chris posts a Twitter rant about Barb.
- 18 September - Chris gives advice to deal with anxiety by detaching himself from reality.
- 22 September - Chris attends a local gem and mineral show.
- 24 September - It is discovered that a debt collection agency is suing Chris for unpaid debt, set for 14 November. Chris also attempts to force his headcanon on Bowsette, the Internet's latest sensation.
- 25 September - Another continuance is issued for Chris's Trespass after Forbidden case, resuming on 9 October.
- 27 September - Chris enters the Newgrounds Bowsette/Super Crown art contest in hopes to win a Nintendo Switch.