Speaking of blood and mucus.....Springtrap, you have some explaining to do.
The whole idea behind Springtrap's character is that he is the murderer who lured and killed the five children that we learn about in the first installment. He also got spooked (according to FNAF 3) and jumped into a spring loaded suit accidentally killing himself in the process.
Ok, great. So we get the origin of his character. Even better, Scott threw in some randomly generated Easter Eggs that show there's a decomposing body within the mutilated costume. Even better! But once again, where's the blood and guts?
Springtrap looks more like an abandoned costume that got treated a bit better than Mangle instead of a walking coffin mixed with a new-age Iron Maiden. Sure, the murderer's body might not have been so badly penetrated by springs to have his entrails hanging out but ideally, according to logic at least, blood stains would be all over the suit. If you're into horror, as I would assume you would be if you're playing this game, then you know how all that works.