Brie Larson, no. Captain Marvel (Movie) is definitely worth ranking. She don't need her dupe unless you are a bit of a tanking player, ie eating specials. Her prestige is a good boost too if your aiming for that.
Her awakened ability isn't all that useful or essential, unless you like tanking specials. She's still pretty good without her sig ability.
I'd agree with it not necessarily being essential but definitely not with it not being useful. Yes it can be used to tank sp3 but it also helps with managing block damage from opponents with crazy attack while setting up heavies to maintain binary as well
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Captain Marvel (Movie) is definitely worth ranking. She don't need her dupe unless you are a bit of a tanking player, ie eating specials. Her prestige is a good boost too if your aiming for that.