One of the 3 Main Characters of Hidden Identities, Ash acts as the Leader of the Guardians working under C. Taking on this job to "pay back some debts", Ash is a overworked and blunt person (who does have multiple jobs) who takes on the missions advised by C. She is known for her cold personality, leading her to be mostly disliked by some strangers, but once you get to know her, you'd understand why.
The 2nd Main Character of Hidden Identities, Eliza is a victim of a accident that stranded her in her own physical manifestation of a perfect world. She forms a deal with Ash (and by extension C) to leave her world to find a new home. A "upstanding" and observing person, her past forces Eliza to put herself first before others, and will make sure her goals never gets sidetracked.
A former (but still kinda) member of the Guardians, Ki believes that the gift that he was given by someone from his past is a curse, but he can't bring himself to hate them. He currently acts as a partner to Ash, who he follows around, helping out in her missions. He is currently seeking something out, and will not be afraid to protect the people he cares about, even if he becomes a monster himself.
C is a Core of the "World Machine", A big system made up of multiple cores like them. They reside in a tall pillar that they can't leave, but despite having no emotions, they are fond of the many worlds that are littered beyond their pillar, and sends out their guardians to protect them. C seems to want to learn what its like to feel again, but there is something in their systems that is forcibly suppressing something they can't grasp.
Charmilla was first seen trying to destroy Eliza's world, but really, she didn't want too! A elegant and prideful woman who will support her companions to the end, she more mature and smarter then you think, She will choose what is the best option and proceed forward, and takes note of everything and everyone around her. She seems to be helping someone find something.
Real name Victor [REDACTED], V is the manager of "Caffe delle meraviglie" and the current vice captain of the Guardians. Thrown into the void at a young age, he was found by the previous generation of Guardians, taking him in and training him. V is a collected person who loves to hear all the stories that he comes across by people in the Cafe, but forces himself to not make companions for fear that he never sees them again. He is currently waiting for someone to truly find him.
Real name Ong Jin Yun, Vincente is a traveler that got forcibly chased out of his world, his gate violently shredded so that he can't return. Found by V, he currently lives temporarily in the Cafe until his gate naturally fixes itself. A man seeking entertainment, he has a more sadistic side should he get to excited, but he holds his morals high. He really, truly doesn't want people to dislike him.
The boy known as "C's Proxy", Alex has some of C's commands (Abilities) and helps Ash with pinpointing an item's origins. Living in the Rift (The Graveyard of the Void), Alex constantly fights back for control over his world's imminent destruction, using C's powers to constantly stop it. Alex actually has the ability to finally leave after 600 years, but he chooses to remain in it until he finishes something. He seems to want to unravel the mystery of something related to C.