By the way, the mimic can be male or female if it mimicking into more character. the mimic is endoskeleton (remember many endoskeleton doesn't gender but they will be male or female if anyone used them for making animatronic) that it doesn't have gender

In fnaf sb ruin the mimic was male because he's Artificial recreation/replication of William afton so and he start to killing cassie in dangerous way

In fnaf sotm, the mimic was allowed to be adoptive parent for David Murray (Edward's son) before bad happened. the mimic isn't adoptive mother or adoptive father but it's both, adoptive parent

About different gender of animatronic, they're male and female when they're normal however

As same mimic they're have no gender but using male and female pronoun. Jackie isn't female because of her same eye that she's really same mimic. Many animatronic are genderless when were they under "same mimic"