Springbonnie is canonically ambiguous which means it has two gender, both male and female because of this design looks full Gender-Neutral and has prominent eyelashe which only used for female character like chica character and JJ, however, springtrap is male since it has William afton's corpse inside the suit

Same with also cassidy who's used to be male or female in different game or story for same reason

Second, nightmare fredbear doesn't kill crying child it's likely because crying child was died after bite of 83 and replaced by Michael afton for night 5-7 as revealed in official theory and fredbear try to kill him as revenge on him for crying child's death it's mostly likely that if he's possibly crying child's alive childhood friendly entity/spirit

Lastly, this golden freddy/cassidy's face "The One You Should Not Have Killed" in UCN was actually originate from Jason Cawthon who's one of Scott cawthon's lovely son as well as one of his family (as revealed by Scott cawthon himself confirmed that)