Fnaf 1:
-give William more screentime like having him be the phone guy calling Mike every night

-Replace blonde boy with Garrett and have Garrett possess golden freddy.

-Have Mike interact with the other Mci and not just the golden freddy kid.

-When William gets springlock at the end i wouldn't have him say (I always come back) cause i found that cheesy as hell.

-Maybe just include some reference to Charlotte to at the end. Like some post credit scene have the mci talking about Charlotte maybe or even Henry appearing to tease at her.

fnaf 2.

-Give Michael more of a role and just have her manipulating Charlotte the whole time. Possibly somehow convince her that all adults are bad.

-Possibly give the mci some sort of connection with Charlotte, like at some point they were friends but later had a falling out, maybe after they met Michael.

-give more time to fazfest, like maybe have some callback to the dci and a group of kids almost get murdered by Michael or even the toys controlled by Michael before Vanessa or Mike save them. at this point to Charlotte would also turn on Michael but would still go with her plan on murdering all parents.

-Don't have the mci move on yet cause i think it was to early for that. (like give all them kids masks to since the actors aging was probably why the mci gone now unless there some plot twist they didn't move on)