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In a previous post, @Fluffy Duckerman was talking about the identity of the Purple Guy. (Link above.) I personally think he is correct, except for a few details.
I don't think that PG used the Springtrap suit to lure the children to the back and murder them. If you recall, in the Night 6 phone call in FNaF 2, Phone Guy said, "Someone used one of the suits. We had a spare in the back, a yellow one, someone used it..." First, Springtrap was green. Second, take a look at these photos. Golden Freddy is yellow (or golden). Scott refers to him as "Yellowbear". Also, look at how Purple Guy and Golden Freddy are both in the same position. They also both appear in the same spot in the office in FNaF 2. In addition to that, they both appear there then just disappear, though Purple Guy does this much quicker.
As @Fluffy Duckerman said, Purple Guy jumped into the Springtrap suit to end his life. However, this is obviously incorrect because he did not know about the spring lock failures.
Tell me what you think about this post, and make sure you have read @Fluffy Duckerman's post.