The Lost Ones is a FNAF/FNATI fan game series created by Malrat_ and Blackout (formerly). As of writing this the series is being rewritten due to it being left unfinished by the former creator.
There are many TLO games (around 9 counting TLO3 (cancelled) and The Truth (Teaser game for TLO3) as well as remakes like FNATI 2017 Remastered and The Lost Ones: Remastered), however to cut down on confusion I'm only going to talk about the ones that're cannon LOL
the lost ones 2 remastered
This game follows you, the protagonist, as you try to escape a cults wrath after bailing in the middle of a ritual. Instead of the 5 nights format it actually takes place over 6 hours. With a new character and mechanic being added each hour.
the lost ones : treasure island
Ah, the TLO's series's Fnati, it essentially follows the same basic story as the official version. With you being Jake Smith, an intern who was sent to Treasure Island. Both to study the strange paranormal activity as well as finding Henry, who went missing without a trace (ahh!)
Despite the base story being the same there a few notable differences, such as the reason that Discovery Island closed in the first place. Being a cave in at the island's attraction, Pirate Caverns, which killed 3 people. Which, there may or may not be some foul play involving a certain demon. Maaaaaybe.
Another notable difference is that Henry and Undying aren't the same person in these games! Which, *mickey mouse voice* is a suprise tool that will help us later.
I cant give as thoughrough of a summary as TLO2R because well. ! the game isnt out yet LOL however there will be undying . this is a promise #yay
I like tlo because there isnt a lot of humanoid centric content out there! while Undying (and by extention Henry) is a pretty utilised character, the same cant be said for God or Hourglass. So it's cool to see them being focused on as main characters + given pretty unique backstories as well!
Also I dont think I would've been here if it werent for TLO, the reason I started my online escepades anyways is because I wanted to make the content that I wanted to see. Despite it being pretty well known theres not a lot of fanart for it, and since I can draw and now code I decided why not? and Im really glad that I did, because I met lots of wonderful people through fnati, and by extention TLO :'D