Red is a symbolic color in The Last Jedi. Writer-director Rian Johnson tells EW the movie is suffused with it. It's also the dominant hue of these teaser posters. This one features Oscar Isaac as X-wing ace Poe Dameron.
Red is also in the mineral-rich soil of the alien world of Crait, home to an old Rebel base that proves to be an important battle for the new Resistance. Here is John Boyega's Finn, now a true "big deal" in that group, standing strong.
Kylo Ren's handmade crossguard lighsaber bears the same scarlet hue as the weapon wielded by his grandfather, Darth Vader. The one Adam Driver's character uses also pierced the chest of his own father, Han Solo.