 If you liked
C³
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 ...then you might like
Violet Evergarden
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Both follow a main character who were raised as weapons trying to adjust to the role of a normal person, but having to battle with the guilt of the sin committed in their past, which is a factor in hindering this goal. Violet and Fear are very different personality-wise apart from not understanding social norms and the general tone and execution of Violet Evergarden and C³ are also contrasting. However, if you particularly like the concept of a 'monster' learning to become 'human', then both series should interest you.