YO This person has stolen Night Vale, Homestuck, and Adventure Time fanarts and is using them to sell T-shirts
by emdra1144. All orders are custom made and most ship worldwide within 24 hours.
Redbubble only allows takedown requests from the original artists so if you recognize any of the artwork please alert them! I recognize works by andarix and @lullabird offhand.
(whatpumpkin is aware of the Homestuck infringements, so presumably all the homestuck-related items will be taken down anyway, but just in case)
(via owlsbuttley on twitter)