First, the character must have a leader ability (not all do). Of the starter characters, Chewbacca has one (as well as Talia).
Second, the leader ability MUST be unlocked. You can check this in the "character details" screen, under "attacks and abilities" in the left side of the screen. I think they are unlocked by gear levels
Third, when entering a fight, the character with the leader ability MUST be in the very first slot of your lineup of chosen characters for that fight.
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Second, the leader ability MUST be unlocked. You can check this in the "character details" screen, under "attacks and abilities" in the left side of the screen. I think they are unlocked by gear levels
Third, when entering a fight, the character with the leader ability MUST be in the very first slot of your lineup of chosen characters for that fight.