It’s possible this character is Captain Cardinal, a trainer for First Order recruits and a big character in the recent Star Wars novel Phasma.
Star Wars: Resistance’s first look art certainly has some colorful characters, and many have probably taken particular notice of the red Stormtrooper at Phasma’s right.
Cardinal essentially played the Phasma part before she joined up, which is why his First Order gear is colored differently from the other Stormtroopers.
Without revealing too much about him, Cardinal and Phasma have a very interesting dynamic, which will certainly be interesting to witness as this new series unfolds, assuming it’s the same character.
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