Sketchbook

Sketchbook is an antagonist in the webseries Don't Hug Me I'm Scared, appearing in the first episode where they served as the "teacher" to the protagonists, singing about how to be creative. As Don't Hug Me I'm Scared grew popular, Sketchbook did as well, and as it wasn't known they were nonbinary at the time, it was a fairly popular idea to humanize them as a woman with rainbow hair and ship them with Tony the Talking Clock, the Sexyman of the DHMIS fandom. As such, they are just as well known as Tony is.

Basic Information
Their first appearance in DHMIS is in the first episode, where they flip open on a table without prompting (notably the only "teacher" in the series to do this; the rest start singing after the need for some kind of lesson pops up) and begin to sing about how to be creative. At first seeming normal, the song quickly turns grotesque and violent, and at the end, Sketchbook says "Now let's all agree, to never be creative again!" and closes up. They make a brief reappearance at the end of DHMIS 6, where they open up in a similar manner to how they did in the first episode and begin singing their song again right as the episode ends.

For more information, see their page on the DHMIS wiki.

Quotable Catchphrase
"Now let's all agree, to never be creative again!"

"Green is not a creative colour!"

Questionable LGBT Rep
Sketchbook has been confirmed outside of canon to be nonbinary.

Theme Song
The first episode of Don't Hug Me I'm Scared is a song mostly sung by Sketchbook, thus it is known as their theme song.

Humanization
They are frequently humanized as an attractive, paper-white woman with rainbow hair.

Power
It is unclear what exactly their power is, but much like Tony, they can cause horrific things to happen and warp the reality that they're in.

Villain
They are the first episode's antagonist, causing the three other characters to suffer.