Lucas Sinclair is a Stranger Things minifigure introduced in 2019.
Background
He is one of the best friends of Mike Wheeler, Dustin Henderson and Will Byers and Eleven.
During the events of Season 2, following Max's arrival at Hawkins, he developed feelings for her, eventually forming a special bond with her. At the end, he and his friends assisted as a distraction to burn the the Mind Flayer's external core for Eleven to close the Gate for good.