He's/She's one of the main commanders/leaders of the rebellion against WICKED. Dal finds a damaged walkie-talkie that was dropped from a rebel helicopter by Will so he/she could tell the people of the last maze what was really going on and why they are in the maze. Unfortunately, when Dal finds the talkie, it cuts out of all the important things will says. And dal is left to assume things and be plainly confused. When Dal and the gladers meet Will, Will recognizes Dal as their long-lost little sister. Will isn't immune to the flare either so they have to be very cautious. And, they're super protective over dal.