Crayfish are awesome this is a great idea!! There’s actually a good number of crayfish/crustacean sonas and characters, give them a google and you’ll find some good inspo. You kinda can’t get away from changing and abstracting the crayfishs anatomy so it works as an anthro design, but you can have a lot of fun w how you choose to do that, some people lean very crustacean and others add fur and different animals features

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