Stuart J. Poptart (otherwise known as Su Tart, which is assumed to be a misspelling of "Stuart") is a fictional Roblox character that was originally created by Roblox user Popcornlady1238. Su Tart first appeared in one of Flamingo's videos named Roblox's most trash sad stories :'( -NOT CHILL-. He is the main protagonist of Popcornlady1238's “Sad Story” and the main antagonist of “Attack on Albert” by a Roblox group called Trаsh Games