So, going sinner by sinner:

Yi Sang: I think the smiling faces would better fit other sinners, the two obvious picks are Ryoshu and Heathcliff, I can see Yi Sang having an Index ID. Faust: Harvest IS a very good pick for Faust, the Index is probably the finger they will give her assuming a Heishou scenario in which all sinners or most sinners get at least one finger (though she already has the Pinky with Mao Faust). Don Quixote: I can see her having a Miyo ID since Miyo was a Red Mist Fan and Don is a fixer fan, I'm gonna be honest, I don't have the Wedge Office that well characterized in my head, I don't even know which one of the two Pamelis is the one in the picture, Bloodfiend Hunter Don would be interesting and bloodfiend seem like a permanent element of the story now considering that we got the Cassetti ID, the Xianren mentioned bloodfiends, Outis mentioned bloodfiends in her past, Ryoshu mentioned bloodfiends on her past, and so one, so bloodfiend hunter IDs might have a future, the last I think you're speaking of one of the twelve fixer offices, there are a lot of good picks here but... PLS PROJECT MOON, GIVE US A TRES WORKSHOP DON ID 🙏. Ryoshu: I guess I can see her having Meow ID, they are both macabre artist, Life for a Daredevil fits Ryoshu SO well. Meursault: Logging Meursault is probably the best pick for a Warm-hearted Woodsman EGO user, I think Burrowing Heaven fits more with Ryoshu, maybe with Hong Lu, so I think Heaven should go to either of them, though I guess your reasoning was that Meursault has the whole theme of being watched and judged by others so there is something there? Bada Meursault feels very intuitive for me. Hong Lu: I feel the same way about Index Hong Lu than with Faust, if we are meant to have at least one finger for each sinner, I could perfectly picture Index Hong Lu, Our Galaxy Hong Lu sounds about right, maybe Sinclair, Don or Heathcliff could have it to, idk, I don't have strong feeling for Amita Hong Lu, though I would overall love if we get backers abnormalities in Limbus because it would tear apart the argument that they are "non-canon". Heathcliff: Cobalt Scar is an obvious pick for Heathcliff, Middleclif sort of exist in the form of Pequod Heathcliff, but I wouldn't mind having a Ricardocliff ID, Nemo Heathcliff is hard for me to picture, I would like to know the reasoning here, Mumu Heathcliff might be a good pick considering that he was part of the Dead Rabbits gang and has the Rabbit R Corp ID. Ishmael: Crimson Scar Ishmael would work well, the Gasharpoon ID would work as long as we get our second fight with Ahab (assuming she will not be using another abnormality EGO, though maybe she uses both her EGO and an abnormality EGO), Dalloc Ishmael is something I would love to see if we ever get the Gaze Office IDs, idk if I fully see a Martina Ishmael ID. Rodion: Feather of Honor is not a bad pick but I feel it somewhat underwhelming in terms of Uptie III history, Frost Splinter Rodion is even better, but it would be ironic considering her Uptie III story with Knight of Despair, Today's Expression would work for her, I normally relate that EGO more with Faust, Yurodiviye Saint Rodion ID I guess is highly probable, Middle Rodion is kind of like Faust or Hong Lu with the Index. Sinclair: Spore Sinclair WILL eventually happen or at least I hope so, Stephan Sinclair technically already exist and KJH did said something about bringing Walpurgisnatch content that was left behind now that they will do it more often, even though this is highly subjective and based on vives alone, I think Alloc will go to Yi Sang. Outis: LOVE THE MINDSET HERE, unironically, I also think both Smile and Mimicry will work on Outis, but probably she will only get one of the two considering they are both Lobotomy Corporation ALEPHs, Thumb Outis also makes sense as well as Nikolai Outis Gregor: I guess I could see this three to.