Sugar Plumps is a character that was from Little Inferno. She would occasionally ask for things and then gives things. Jack gave her a Gru / Russian like accent.
*!!Spoiler Alert!!* *!!Spoiler Alert!!
When she ''dies'' Jack reacts sad but goes back to burning stuff. But that means he cared (well a little).
- Like many characters in Little Inferno, she likely has pyromania.
- Undisputedly one of Jack's favorite characters ever.