FNaF World: Universal Madness in Supder Dupder cool LivingCorpse7 Fan-Community
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Character unlock/minipuzzle proposal! Mr. Hippo
You know... this reminds me of a story...
Enemy/character proposal: The scrapped animatronics
This might get weird, but the end result would be cool (EDIT: thought something for Easter Chica)
Continuing new proposal! Challenge runs (Part 3)
About how to access them 
Possible gameplay concern: About placing overpowered shortcuts in the game
I mean the Glitch World, Halloween Backstage, etc.... (perhaps this is controversial)
Continuing new proposal! Challenge runs (part 2)
We all needed a sequel, right? (EDIT 2: added another)
Checklist: Missing renders for playable characters from videos
P.S.: in the DeviantArt render, some are older models, so what is shown here may not be up to date
New ability proposal! Amalgamation 
It can use a random high-tier ability (like Scooper or Cosmic Song) from one of its constituents (hope it's not too close to Blob)
Enemy proposals: Apocalypse Freddy and Apocalypse Foxy
Yes, there are no images for them
Final skin proposals (excluding SOTM, spin-offs and other fan games)
These should be the last if I'm not mistaken:
- Movie Sparky
- Movie Ella
- Movie Golden Freddy
- Torture Freddy (aka Shreddy Fazchair)
- Punk Glamrock Helpy
Gameplay suggestions: QoL changes (render by MarioKid1285)
These would be nice indeed