Pandora

Pandora was a very good friends with Ana until they were separated. Upon learning of Ana status after she reincarnated Arata into other world, she changed from the happy smiling girl to a more serious one and is a cold-hearted person. Ana's status and decision completely changed who she is. She meets Arata when he wakes up whom he mistakes her for Ana upon correcting him who she is, she later guides him through the place where he was reincarnated.

Personality
Pandora used to be a happy and a cheerful person, and she loved Ana more than anything. She would even go as far as risk her life to a near death situation to save a friend (Ana) whom was demonized. Pandora is a strong willed person and in combat she doesn't hesitate in the least. However she can be very emotional when it comes to friendship. Even when she was trapped with her comrades in a different world, she shows no fear. Upon Ana and her four knights left her to the original world, she stayed behind having been very patient. She loved being around her friends more than anything else.

However this all changed when Ana didn't return whom she decided to wait for, whom unbeknown to her, that she sealed the "End" and was called the Saint of Betrayal. This intensified even more when she later learned that she reincarnated Arata and was trapped in the Garden of Souls for eternity. Even though she doesn't blame Arata since it was Ana's decision to begin with, but she has hatred for him stealing Ana's love, whom even promised her years before who will win their love first. She became a cold-hearted person and decided to become strict to never make the same mistake again. Now her smile and cheerfulness has gone, and even hates long conversations. Arata felt her demeanor is similar to Ana but is cold.

Appearance
Pandora resembles Ana a lot to the point that Arata has mistaken her for Ana. Pandora has a long light-blue hair which resembles Ana's style. Her attire consists of a robe that reaches till the bottom of her outfit, only revealing her shoes.

Chronology
Pandora first appears after Arata woke up from his bed, she enters the room whom Arata firstly mistakes her for Ana. She denies she's Ana and informs him that Ana is in the Garden of souls. Pandora proceeds to tell him her name, that she is Pandora, the knight of the Demon King. Pandora then tells him if he's done waking up to follow her. When following her, she informs him more that he has been reincarnated by Ana's spell. Arata then understands why he is a child and his body getting smaller due to reincarnation. However she corrects him that it was Ana's carelessness that she got smaller. This surprises Arata as it was by mistake. She tells him what happened is that Pandora made a mistake in setting the age of the body as the vessel of the soul, moreover that even Ana can't help but make mistakes, and it can't be helped. Arata wants to know what happened and asks her a series of questions, wanting to know what is currently going on. This irritates Pandora and tells she doesn't want to talk. She gets to her point that in all honestly she hates him for being liked by Ana. But Arata apologizes that it was for her she made this sacrifice. Pandora tells him he doesn't have to apologize since Ana made her decision herself. They finally arrive at a place that has a huge crystal, and images starts showing up a disasters and destroyed world, which Arata believes that this was what Ana talking about, a world dominated by the gods, as he quires if it's true. She coldly says to him that it's his fault, and that due to his loss, everything in the world became what can he see, to which Ana continued to pray in the garden of the soul. Otherwise Ana wouldn't have used the reincarnation secret method. Arata redeems himself that it was mistake to challenge Aryan absolute power. Even though Pandora says there were other ways to fight. He then asks Pandora what should he do, as what did Ana expect from him, wanting to know what should he do as Pandora being his only hope. As she is about to talk, she is interrupted by someone who is floating above them. Laughing, and commenting that the whole scenery is rather cute.

Abilities
Pandora hasn't shown any abilities or powers nor techniques ever since she was isolated in the other world years ago, it is possible she has lost them or not yet revealed. However, before when she was young, she has shown incredible abilities.

A former and different world Demon King of a woman who once destroyed her own world and arrived at the End of the Library. She had two living bodies, Anastasia and Gourd. She received educations by Ana who asked for a conversation partner, she regained a clear ego beyond the residual thoughts of the Demon King factor. Pandora even had the power of stopping the runaway and demonization of Ana by Altana experiments, and even though she her self was experimented on by Altana for the Arbitrator to regain her mage abilities.

Altana gave Pandora a fake sword of the demon king weapon Antenora, and his demon king ability (Demons Gift) is a demon servant (Emperor Slave) that interferes with other demon king factors. This makes it possible to perform a wide range of tricks such as possessing and commanding the Demon King factor to the mage of the earthly world, owning the power of the Demon King knight who has signed a contract, and sucking up the magical power from the Demon King knight under interference.

Even after that Pandora managed to retain her sanity, and that she was fighting Ana.

Relationships
Anastasia-L - Ana and Pandora were very good friends, that the latter even sacrificed herself once to seal the "End" and then reincarnated. Pandora cares very deeply for Ana, and likewise. She gave her a reason for living and Pandora emotionally refused to leave her alone, but she decided to wait for her till the time comes and meet again despite Pandora now in an isolated world, that can never be acceded to, Pandora even confessed her "love" for her friend. After learning that due to the final ultimate reincarnation Ana used to reincarnate Arata and became trapped within the Garden of Souls for eternity. Pandora changed and became more serious, a very cold person and became apathetic. Though she doesn't blame Arata for that, as it was her decision. But her cheerfulness and smiles have disappeared forever, she even dislikes long chats.

Arata Kasuga - Pandora hates Arata for being loved by Ana, this shows jealousy even though she doesn't show such a face and hides it. However she did help him and guided him when he was just a child, yet she dislikes him, but doesn't blame him for what happened to Ana since it was her decision. She was willing to give him advice (though this is possibility he was just clueless and nothing more). Overall she dislikes him, as well Arata finds her similar to Ana but the difference is that she is cold to him.

Altana Magnus - Altana both used her and Ana as experimental subjects in order for the Arbitrator to regain her current position, she forced the two to fight each other. She has hatred for Altana for doing so even after Altana managed to separate the worlds thus making it possible to escape the closed isolated world, she still disliked and hated the Arbitrator for doing so, as she goes over and ask her what are Arbitrator thoughts. Pandora even said that even if she apologizes and shows a nice face she won't forgive her. Currently she doesn't seem to show that much hatred as before, as she remained silent when Altana laughed at the situation they are in.

Trivia

 * The Pandora myth is a kind of theodicy, addressing the question of why there is evil in the world, according to which, Pandora opened a jar (pithos) (commonly referred to as "Pandora's box") releasing all the evils of humanity.
 * Pandora has many meanings, in many ways.
 * Pandora is the only other friend to Ana other than Ayesha who is her best friend.