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Spoilers below
Aren’t most of those said explicitly? Also the Whishes seem mostly born from different kinds of wishes, Echo from a falling star, Phillip’s from a wishing well, the 100 cranes from, well, the 100 cranes Owen folded (y’know, that legend thing), Halley I think is a dying wish and the lady from the lake is either a mother’s wish or a dying wish as well (or both?). The remnant is probably a suicide wish, maybe it’s a corrupted Echo or Euca made another wish later; I’m pretty sure it’s his considering in Jinny’s flashback Euca is seen hanging and the remnant literally having a noose around its neck (considering time and memory shenanigans I’m not even sure wether or not either one is from this “timeline”’s past).
Where their strenght lies and its extent also seems strongly related to the means of their creation, like how Echo is stronger when there’s a meteor shower or how Cecilia’s is weaker away from her lake.
Spoilers below
The hanging flashback is in Sissel’s route, I think?
Also Echo’s camera’s holder-thingy looks a lot like a noose as well, even more the more he’s damaged, thus why Echo and the remnant are probably the same wish (Euca probably wished to die or something when he was 6 and saw the falling star, thus why echo hopes he never gets granted) but with time shenanigans involved
I'm basically about to vomit information at you that may or may not make sense.
Echo is Euca's wish, depending on the route you take, he gets weaker and weaker, whatever we're doing is either straying away from the path to fulfilling our wish, or the opposite and getting closer, so he would just disappear when we complete it. However, it could also be that since he refused to tell us what we wished for, which means he's consciously trying to avoid fulfilling the wish. Side note, when taking Sissel's route, after rewinding time, your will to fix the past is strengthening, so shouldn't Echo get stronger?
Remnant isn't just a wish away, he has ungodly strength, but we never really know why he is there to begin with, we don't even know who brought him into existence. That being said, he wouldn't haunt the main cast in particular if it had nothing to do with it, so is he a wish Euca had made with a full throttle will during a low in his life? Is he the result of a really fucked up Echo, after avoiding his whole purpose, and remained after Halley rewound time, who is he even linked to?
Everyone has a wish guardian in one way shape or form, Remnant isn't directly linked to anyone, all he's shown the desire for is utter chaos, or.. or the truth, he's also shown minute kindness in giving someone what they want, even if it isn't always the best thing for the person
im a bit late to this but more than likely its a chain of wishes, jinnys wish would be to save the main character ( since you know) which would make it understandable on why halley can rewind time. the only problem im having is with the main character, all wishes symbolize their wisher in some way (echo has a noose around his neck not sure about halley bur bare with me) this makes sense. but halley in the start of the game said something along the lines of " echo is a useless wish " and "he would turn into something vile" or something along those lines, even though later she confirms she doesn't keep her memories. but echo also confrirms that remnants are " dead wishes " so wouldnt that mean, in some shape or form the remnant is the mc's " dead wish ". this would also imply that echo is going to (or already has) turn into a dead wish (since you know, grandfather paradox).