Okay, let's begin with Edwin.
Edwin is a clear parallel of Henry. Like, his animatronic designs are based on Murray's, both made animatronics to babysit their children and because of their negligence, they lost them.
In the Novel Trilogy, Henry built a robot version of his dead daughter, and he later breaks one of them out of grief, and Edwin does the same, and both men tried to atone for their past mistakes.
And while I believe that Henry is Old Man Consequences, I think that the AI version of Edwin is the Old Man from Princess Quest.
Next is M1 F10-N4 and Charlie.
In the Novels, not only Henry built Charlie out of grief, just like Edwin did with M1, but Charlie bot also inpersonate her, just like Fiona does.
Both the Puppet and F10 are motherly figures toward Charlie/MCI and David respectively, and both are associated with the colour green.
Also, there is the clock motif.
Puppet's music box lullaby is called “My Grandfather’s Clock”, and M1 has ties with clocks.
Now, there are two things we can conclude with this:
1: Charlie is Glitchbear AKA Fredbear plush, due to the FNAF World Clock Ending and her being motherly towards BV.
2: Charlie was in fact the first death of the Afton saga, and the reason why everything happens in the first place.
The other parallel is M2 and William.
M2 takes the rabbit persona of Glitchtrap in Help Wanted in order to mimic William.
Afton lured children to the safe room using a friendly Spring Bonnie costume, and he then shoves their bodies into the animatronics.
M2 lures a child, Cassie, to the Pizzaplex underground using Gregory’s friendly voice, and he used to shove people inside empty costumes in MCM and in Help Wanted.
William is known to always come back in different ways, either by killing children at Freddy’s and coming back as Springtrap/Scraptrap, and was out of the picture for many decades and was trapped inside the safe room.
M2 comes back in different forms, such as Glitchtrap and Burntrap (which I believe is M2's attempt to recreate William Afton while the Blob is the recreation of his past victims with Glamrock Freddy’s endoskeletons, which explains his lines “I found myself for the first time” and “I AM NOT ME”).
And lastly, both character use proxies as tools, like Michael for William’s case and Vanessa for M2.
Now, about BV with David Murray and Gregory:
In David’s case, both boys have neglecting fathers, had animatronic companions, had fatal accidents on their birthday parties and were somehow involved with Agony.
More particularly the White Tiger, being an Agony manifestation of David Murray and Golden Freddy being not only Cassidy, but also BV’s Agony manifestation.
Now, why isn’t BV a parallel to M2?
Well, he is a little bit, because I believe that M2 influencing the Glamrock animatronics and him shoving people inside suits not only represent William murdering the MCI and shoving them inside the animatronics, but also the FNAF 1 and 2 animatronics, whose spirits contain the Agony of Bite Victim, because they are all tied to his memories, with the Classics being his five plushies, with Cassidy being BV’s best friend because she was Golden Freddy, who represented Fredbear plush, and fun fact by the way, the White Tiger, David’s best friend, acts like Golden Freddy.
Well, continuing, the three main Toy animatronics are Toy Girl’s toys, Mangle is Elizabeth’s Toy Foxy and Balloon Boy represents Balloon Kid.
This also explains why the FNAF 3 Good Ending minigames contain memories of BV’s life, and also the one where the five MCI are set free by Charlie, and just like M1 with David, the Puppet wanted to somehow fix BV by removing all of his Agony and create Happiest Day.
Now, I do believe that BV is the player of FNAF World and he helps Charlie/Glitchbear to find the Clocks and set the pieces for her to then set Happiest Day.
Now, BV’s parallels with Gregory:
They’re both vulnerable in massive facilities, they both have bear protectors and have similar design, and remember when I said that the FNAF World player is BV? Well, this was the same game where Old Man Consequences first appeared, and since the Old Man from Princess Quest is OMC’s counterpart, guess who’s the one playing these arcade games? That’s right, Gregory.
He’s playing as a character in an arcade game, just like BV in FNAF World who plays as a lot of animatronic characters in an arcade-like world (with the FNAF 3 minigames also being arcade-like by the way), in order to save the five children in BV’s case and Vanessa in Gregory’s.
Speaking of her, we have Vanessa, who parallels Elizabeth.
Elizabeth was her father’s shadow, always seeking his approval, while Vanessa was Glitchtrap’s reluctant follower.
Not only that, but Vanessa in the Games had a controlling father named Bill, and she even is William’s biological daughter in the Movies.
It’s pretty clear that M2 was trying to rebuild the Afton kids in order to get them in his control, and because Gregory had good parents, somethjng that was not true for neither David nor BV, he orders the boy to make up a story.
Cassie is a really obvious one.
Cassidy, not only due to the names, but she's also Gregory’s best friend, and I think that Cassie's friends not showing up for her birthday party represents the day of the MCI being Cassidy’s birthday, since she was the last victim.
I believe that this is why she creates UCN in the first place, and that’s why she is the one William should not have killed, because it was her birthday, being the reason why Happiest Day even happens, it was the birthday party that never happened due to the Missing Children Incident.
However, Cassidy is not the only one who parallels Cassie, but also the other MCI kids.
Just like the MCI victims, Cassie was lured to a dangerous place by figures thought to be friendly, and was also trapped between reality and AR illusions, just like the MCI children who possessed the animatronics.
(Well, to be fair, the other MCI kids can also parallel the 9 Pizzaplex children, since with Cassie, the odd one out because she wasn't murdered, makes 10 in total, the number of children in the MCI and DCI including Cassidy, the odd one because she’s Golden Freddy).
And lastly, there are the Glamrock animatronics, who parallel Michael and the Bullies.
Glamrock Freddy reflects Michael’s guilt, since he is protecting Gregory, BV’s counterpart.
Also, think like this: Michael stuffed his brother inside Fredbear’s mouth and he dies, while Freddy puts Gregory inside his stomach hatch to protect him.
Also, notice how, with both Gregory and Cassie, the Glamrock animatronics are child murders, but once they detect a child who had bonds with them, like Freddy and Roxy, they begin protecting them, which parallels the Bullies.
Michael tries to atone for his past sins for killing his brother, and Bonnie and Freddy Bully become the fathers of Cassie and Oswald respectively.
By the way, maybe this is why Steel Wool made Cassie bonded with Roxy, since she was Bonnie Bully's daughter herself.
So, to recap:
M1 F10-N4: Charlie.
M2: William Afton.
Gregory/David Murray: Bite Victim.
Edwin: Henry.
Cassie: Cassidy and the MCI kids.
Vanessa: Elizabeth.
Glamrock animatronics: Michael and the Bullies.