Characters / Blue Archive SCHALE

Blue Archive Character Index
Schools: Abydos High School | Arius Satellite School | Gehenna Academy | Highlander Railway Academy | Hyakkiyako Alliance Academy | Kronos School of Journalism | Millennium Science School | Red Winter Federal Academy | Shanhaijing Senior Secondary School | SRT Special Academy | Trinity General School | Valkyrie Police Academy | Others
Organizations: General Student Council | SCHALE | Other organizations & characters
Enemies: Decagrammaton | Gematria | Others

Independent Federal Investigation Club SCHALE, or simply "SCHALE", is an extrajudicial, autonomous organization founded by the mysterious General Student Council President prior to her disappearance.

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Sensei

Arona's impression of Sensei, drawn during Episode 3 of Arona Channel on the JP Blue Archive Youtube channel.

Sensei as portrayed by the animated adaptation.

Affiliation: SCHALE

Age: N/A

Birthday: N/A

Height: N/A

Hobbies: N/A

Illustrator: N/A

Voiced by: Shogo Sakata (anime)

The Player Character and head member of SCHALE.

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• Accidental Pervert: Happens a lot in the students' Relationship Stories.
  • In her first episode, Yuuka sees they spent 20,000 yen at "Club Smoochie", making her think that Sensei has been spending money at a hostess club when in reality Club Smoochie is actually the name of a gacha game.
  • When they're enamored with Hasumi's wings and ask to touch them, they ask in such a way in which Hasumi mistakenly thinks Sensei wants to touch her large breasts instead.
  • Implied to have happened too in Neru's relationship story. Neru told Sensei to close their eyes and grab her hand, but the following dialogue implies Sensei grabbed something that's not her hand.
    Neru: Grab my hand. Hey! That's not my hand! *sigh* Don't surprise me like that.
  • In the Gourmet Research Society's 2nd episode of their sub-story, after another bout of disturbing the peace, the foodies find themselves in the same Prefect Team holding cell as Sensei's. Haruna guesses they were arrested on suspicion of... illicit activities. This is later confirmed by Hina, who walks in to free Sensei of charges after an investigation—only to see him sniffing Akari's panties offered to him for the scent of truffles they had held.
    Haruna: Let me guess. You were thrown in here for being a degenerate again weren't you?
    Sensei: "That's not true! I was framed!"
    Akari: I have a hard time believing that knowing you, Sensei. ☆
• Beware the Nice Ones: While Sensei is genuinely a nice person they are not afraid to scold any particularly troublesome students. Niya end up learning this the hard way.
• Berserk Button: They absolutely hate it when people trick their students. In Saori’s valentines story they were uncharacteristicly angry when Saori was tricked into thinking giving low quality chocolate won’t be an appropriate show of appreciation.
• Blithe Spirit: Because of their willingness to help all students no matter what, every story that has Sensei involved is bound to have their problems resolved and students come out of them better. Not even an alien invasion in Volume F could stop them from working their magic. This has a particular effect for those who have done wrong, bound by their prejudices, or simply in need of someone's support, which includes Hoshino (who thought there were no good adults), the Tea Party (who needed to learn how to have faith in others), the Arius Squad (who grew up only knowing violence), Wakamo (whose violent tendencies went uncurbed), Kanna (whose pragmatism took over her honor), Rio (who had only her own self-righteousness), Aris (who thought she had to die as a villain), Akira (who was alone in her thievery), FOX Squad (did not how to handle responsibility), the Hyakkaryouran (who all had problems with lies), and so on.
• Chick Magnet: Sensei has a propensity for charming the various students of Kivotos in their side stories, usually resulting in crushes that are blatant to different levels.
• Chronic Hero Syndrome: Each and every Main Story Volume and event is at least driven partially because Sensei is there to help their students. Both times when Black Suit warns them that the cost to using their Credit Card in Volume 1 and activating the Utnapishtim in Volume F is a part of their life, their answer is effectively the same: anything is worth the cost for their students' sakes.
• Comes Great Responsibility: As made explicitly clear during the confrontation with Black Suit in Volume 1, Sensei is motivated to help the various student groups who reach out to them simply because they're an adult and a teacher in a position to help them, and "it's the responsible thing to do."
  Sensei: "Because no one else is willing to take responsibility and help these suffering girls."
• Cool Teacher: They are essentially called "Teacher" in Japanese if you haven’t realized—and it is their main job. Besides being a capable leader for their students in firefights and unravelling villainous conspiracies, Sensei takes their duties as a teacher seriously to the point of being more like friends with their students, helping out with whatever problems they have as an adult is obligated to.
• Covert Pervert: Has these moments with a couple of students, moreso Iori and Karin.
  • In Iori's first Relationship Episode, Sensei doesn't hesitate to say that the view up her skirt is pleasing for them. This prompts Iori to beat them down.
  • In Karin's Story, after stopping an angry customer, Sensei demands Karin to step on them as a reward.
• Deadpan Snarker: Despite being the Nice Guy, Sensei can surprisingly be snarky on rare occasions.
  • Sensei shows a lot of their snarky side for the first time in the Cherry Blossom Festival event.
    • When Shizuko mentions that the Inner Discipline Club is composed of weirdos, Sensei proceeds to ask these questions:
      Shizuko: So, the Inner Discipline Club. They're kind of... How do I put this? Their members are known to be kinda weird.
      Sensei: "You think they're weird? Weirder than you?"
    • Izuna also gets a dose of Sensei's snark:
      Izuna: An amateur mistake! Izuna will retreat for now, but next time will be different! You better be ready, Sensei! You'll meet your match then!
      Sensei: "You sound like a generic anime villain right now..."
    • When Shizuko tries to somewhat sugarcoat her words:
      Shizuko: We'll just have to find the culprit ASAP so I can take my frustrations out on that stupid jerk!
      Sensei: "Tell us how you REALLY feel, why don't you."
  • From Onsen Nodoka's relationship story:
    Nodoka: Won't the guests be amazed and give me large tips if they see me gliding about with large piles of laundry like this?
    Sensei: "Are you thinking of a hot springs resort or a circus?"
  • Sensei makes a lot of snarky comments during An Unconcealed Heart.
    • This conversation sums up Sensei's snark towards Shizuko:
      Shizuko: Oh! I recognize you now. You're the weirdo leader who plays ninja all day!
      Michiru: Who're you calling a weirdo?!
      Sensei: "You know, the Momoyodou are pretty weird themselves."
      [...]
      Shizuko: You all have it totally wrong! Where did you even hear that?!
      Sensei: "The service at the Momoyodou IS pretty maniacal..."
      Shizuko: Et tu, Sensei?!
    • At Shizuko's attempt at showing off:
      Shizuko: Because I, Shizuko, as the face of Momoyodou, am the perfect choice to be the very first face that greets you in this adventure!
      Sensei: "Was that supposed to be cool? Funny? Should we laugh now?"
    • Another one at Shizuko's expense:
      Shizuko: "It didn't occur to me during Hyakkiyako Cherry Blossom Festival, but theatrics of that caliber... might be worth a pretty penny..."
      Sensei: "Momoyodou's owner never misses a chance to turn a quick buck, huh?"
      Shizuko: "Don't say that like it's a bad thing!"
    • At Niya's commentary of the Princess Waraku event:
      Sensei: "Wow, she really is just airing out all our dirty laundry."
    • When Tsubaki falls asleep mid-sentence:
      Iroha: She fell asleep mid-sentence... Are Hyakkiyako students all just like this?
      Sensei: "Unfortunately, more or less."
    • As supportive as Sensei is with Izuna's dream, they still snark at Izuna:
      Izuna: Yep yep! I prepared a little something special for situations just like this!
      Sensei: "This is what you waste your time on..."
  • In Volume 4 at Descartes's Hypocritical Humor:
    Sensei: "Ah, yes. I, too, love the noble pursuit of non-possessiveness."
  • Sensei also makes some snarky comments during the Momoyodou Beach House Franchise Plan event (once again mainly at Shizuko's expense).
    • At Shizuko's rhetorical question:
      Shizuko: What kind of weirdos are so obsessed with hot springs development?
      Sensei: "I'm guessing people who join the Hot Springs Department?"
      Shizuko: Thanks a lot, Captain Obvious!
    • At Shizuko's idea of a Decapitation Strike against the Hot Springs Development Department:
      Izuna: Sh-Shizuko! Your plan is scarier than some of the scenes from my period dramas! Eek!
      Sensei: "Shizuko is even scarier than the hot springs fanatics..."
  • From Michiru's relationship story:
    Michiru: Yes, so we upload videos twice a week. We need to upload a new one soon... But I have no idea what to post next... We're completely stumped! We've been driven into a corner! We might as well just title the next video "Michiru! A Youth's Crisis!" That's why I messaged you on Momo Talk. I just completely forgot to explain the rest!
    Sensei: "So you experience a crisis like this twice a week, Michiru?"
  • From a Momo Talk conversation with New Year Aru before a relationship story:
    Aru: Last time I...I rented that expensive kimono, right?
    Sensei: Yeah, you were so gullible, Aru.
    Aru: W-Wait! About that, it was part of a strategic investment! I contacted you today to let you know I found a way to put the outfit to good use!
    Sensei: I did think it would be pretty on display in a room. Need help?
• Depending on the Writer: In the various students' side stories, Sensei's main character trait is being a Foil to the student in question. How that gets expressed changes from story to story: they can be a Manchild or The Gadfly that Yuuka or Karin have to put up with, a Straight Man trying to keep a handle of Saya or Mutsuki, or The Workaholic who needs to be kept on a leash by Serina or Chinatsu. And then you have poor Iori who gets ruthlessly, yet playfully, teased and caught in compromising situations around them. Ultimately, Sensei is more "normal" than most students, being more or less a Manchild semi-consistently.
• The Dreaded: Once SCHALE starts getting things done, Sensei becomes widely feared among Kivitos' criminal underworld and Gematria due to Sensei's ability to completely dismantle their plots. It has even gotten to the point where random delinquents on the street can recognize Sensei.
• Determinator: Once Sensei has decided to lend their aid to whichever student or club has asked for it, there is almost nothing that will get him to give up on them. Nagisa's increasingly obstructive interference during Chapters 1 and 2 of Volume 3 doesn't deter them. Even after getting shot during Arius' attack on the Eden Treaty signing and passing out, the first thing Sensei does after recovering and waking up is to assure the Trinity and Gehenna students with him that they're still helping them before heading out to rally the two schools' forces against Arius and the Justina Saints.
• Everyone Calls Him "Barkeep": Not even the Sensei, just calls them "Sensei", barring some other names students have for them.
• Even the Loving Hero Has Hated Ones: While Sensei is a very kind person to the point of forgiving students that are known to be destructive like Wakamo, they absolutely despise fellow adult Beatrice, who saw her students as tools and taught them only to hate, then callously put the numerous lives of both her own people and others at risk, all for the sake of gaining power and merely seeing it as a natural right of an adult—all of which stand against Sensei's belief that adults should take responsibility. This prompts them to tell her to shut up and declare her their enemy.
• Featureless Protagonist: None of Sensei's physical features are ever seen in-game. The only impression of their face ever given in the game's canon is a doodle of their face drawn by Arona when she's flexing her facial recognition powers during Arona Channel episode 3. The 2024 animated adaptation depicts Sensei as a young adult man with short black hair and a suit, while the Game Development Department and Problem Solver 68 manga series both give their versions of Sensei different appearances, with the GDD Sensei sporting the Doodle Sensei face on a towering frame, and the Problem Solver Sensei being a bit of a pretty boy with an air of tiredness about him.
• Figure It Out Yourself: They often take a hands-off approach when it comes to their students at times to let them act and grow independently as part of a lesson of taking responsibility, especially for one's actions. Hence, it's often the students driving the story forward rather than Sensei alone, who only takes center stage when the situation calls for it.
  • In Volume 4 Chapter 1 during the break-in of Valkyrie Academy, Miyako suffers a mental breakdown when the team gets trapped in a vault and pleads for Sensei to take over command. Rather than obliging, Sensei encourages Miyako that things aren't over yet, getting her back on her feet to lead the team.
  • In Momoyodou Beach Shack Franchise Plan, the (former) Kaiser PMC's Director accuses Sensei of having led the students once again to the robot's defeat like they did with Abydos, but Sensei make themselves clear that they did not do much; it was Shizuko and her friends' determination that saw them through the takeover of the islands.
• From Beyond the Fourth Wall: In the final battle of Volume 3, Chapter 3, Sensei acts like they're about to use a Dangerous Forbidden Technique, and whip out their credit card. For the first time in story mode, the ensuing battle allows you to use your account's students that you rolled and raised yourself rather than the "canon" ones. Maestro, who's observing the scene unfold, makes comments that strongly imply this isn't just a gameplay thing.
  Maestro: Ah... That must be it! So this is the card I've heard so much about! Power gained in exchange for your life and time... An incomprehensible force with origins and limitations even we can't understand! I wonder what Golconde would have called it... He'd probably say it requires metacognition to understand. Very well, Sensei. Show me the price you have paid. Show me power worth pawning your life over!
• Gender-Inclusive Writing: Given that they have no defined features beyond what everyone considers a Mystic-less average human, what few times they are referred to by pronoun is always "they".
• Heroic Sacrifice: After Phrenapates is defeated, their space station begins falling apart, necessitating Sensei using a teleporter to send their students to safety. However, instead of using the last teleport for themselves, Sensei instead uses it on Anubis. If not for Arona and Plana's intervention, Sensei would have died on the space station.
• Hidden Depths: They're a fan of Mecha.
  • In Yuuka's first Relationship Story, they've spent "10,000 yen on limited edition transforming robot toys". Apparently, square meals are a small price to pay for them.
  • In VFC2, they call on the Kaitengers to fight a Chroma-controlled Perorodzilla, having their Kaiten FX Mk.0 gigantified into the Kaiten FX Mk.∞ to match. Given that Sensei even shouts a power-up line for the gigantification sequence, it's pretty clear they've seen plenty of Tokusatsu and Kaiju shows.
  • They turn out to be a Godlike Gamer in Momoi's relationship story by beating "Dark Spirits 4" (which is clearly a Bland-Name Product referring to the infamously difficult Dark Souls series) in one sitting, whilst presumably playing it for the first time. As in, it's daytime when they start, night when they finish, and there's no indication that more than a day has passed. The Dark Souls games normally take 30+ hours each just to go from start to finish without doing any side activities.
• In-Series Nickname: A couple of students have different names for them. So far, there's "Master" (Asuna and Akane), "Boss" (Pina), "Trainer" (Sumire), "Lord" (Izuna), "Sir Sensei" (Michiru) and "My dearest/beloved" (Wakamo).
• Laser-Guided Amnesia: Sensei remembers speaking to the GSC President and the password to the Shittim Chest, but nothing else prior to meeting the GSC Vice President.
• Leaning on the Fourth Wall: In a MomoTalk chat before Kayoko (New Year)'s third Relationship Episode, Kayoko asks what talisman Sensei wants. They can reply with "One that helps my gacha luck!" or "One that helps my Crit DMG rate!" Kayoko becomes unsure before Sensei says they're joking.
• Magnetic Hero: Due to their dedication to protecting all students in Kivotos, Sensei has an uncanny ability to win over the loyalty of pretty much every student they encounter, including ones that were previously antagonistic towards them like Wakamo, RABBIT Squad, Mika and the Arius Squad.
• Messianic Archetype: Just as Blue Archive leans heavy on Christianity motifs, Sensei has various traits that heavily echoes that of Jesus Christ.
  • Sensei is frequently depicted as an All-Loving Hero who garner the interests of not only the students, but even some of the villains.
  • Sensei is often portrayed as a savior to the students, who can look at them past their sins. Most prominent in Eden Treaty where they're able to redeem Saori and Mika.
  • One of the keywords for Blue Archive is Miracles. Sensei is often attributed to as one of the few characters in the game who can create miracles through the Shittim Chest.
  • During VFC1E15, when Sensei sends a message to all students after retaking SCHALE, the number 11:47 is prominently shown on the student's phone. The relevant quote in the Bible, John 11:47, mirrors the depiction of Sensei as a miracle worker who garnered the trust of every student in the city.
  • During VFC4E7, after sacrificing their only teleportation sequence to save Anubis, Sensei proceeds to fall off from the Ark of Atrahasis. For a brief moment, the game shows the sun rising and setting three times over the scene of the Shittim Chest's classroom, then the church, and back to the classroom. After this, Plana and Arona combine their power to create a miracle to save Sensei from falling to their death. The miracle that is the resurrection of Jesus happened on the third day.
• More than Just a Teacher: Assuming it's in line with real world standards, the average teacher shouldn't be able to command students in gunfights with ease or whip out some kind of credit card that, apparently according to Black Suit and Maestro, is a Dangerous Forbidden Technique that lets them defeat an Angelic Abomination or a small army of ghostly saints. It should also be noted that Sensei is an adult, something acknowledged by their students as well as all of Gematria's members, who regard themselves as adults, though what make this significant is unclear.
• Nice Guy: It is apparent that Sensei is genuinely a friendly person who is fully invested in the lives of their students, regardless of their often wacky quirks.
• The Power of Trust: As Sensei themselves put it, this is their real power, not their credit card, because no matter what, a teacher must always stand with their students. For the couple of times this caused trouble, it paid off when they chose not to suspect any of Make-Up Work Club for being a mole, Mika appreciating Sensei being there for her even when she revealed herself to be that mole, refusing to use a halo-destroying bomb to collar Saori because Sensei wanted them to be equals, or the FOX Squad chiding them for accepting gifts from enemies like themselves so readily, but coming around to trust them in the end. By the events of Volume F, every single academy has full trust in them to act as their peacemaker.
• A Protagonist Shall Lead Them: A given for a gacha game.
• Pre-Asskicking One-Liner: Sensei surprisingly has one before he starts lecturing Niya at the end of the An Unconcealed Heart event:
  Sensei: "Well, buckle up, kiddo. I've got a lot to say to you."
• Pursued Protagonist:
  • Gehenna used the presence of Problem Solver 68 in Abydos to justify invading the latter school's territory... as a cover story to kidnap Sensei to keep SCHALE from interfering with the Eden Treaty between Gehenna and Trinity. Luckily, Hina cuts off the attack.
  • Invoked and then subverted in V3C4, when the members of Arius Squad mention that Beatrice promised them amnesty for their prior desertion if they kill Sensei for her. However, none of the Squad took her up on the offer and are instead willing to work under Sensei's leadership to rescue Atsuko.
• Save the Villain: Downplayed given that a majority of the villainous students they face are misguided at most and easy to sympathize with, but they take the cake in Vol. F in saving Terror!Shiroko—who was complicit in nearly dooming Kivotos to the Chroma—by using their only Escape Sequence to teleport her out of the falling Ark of Atrahasis instead of themselves. After all, they are all students adults must guide in the end, no matter who or what they are.
• Spanner in the Works: Kivotos's criminal organizations were absolutely capitalizing on the disappearance of the President of the General Student Council. Sensei's arrival in Kivotos and subsequent rallying of the students behind Schale ultimately begins the undoing of innumerable criminal plots.
  • Also seen as this by Iori and Ako of Gehenna's Perfect Team in regards to the possibility of them interfering with the Eden Treaty.
  • Beatrice of Gematria identifies them as perhaps the most significant roadblock to her future plans, and unlike Iori and Ako, her preferred method of neutralizing Sensei is decidedly more permanent.
• The Strategist: Sensei is apparently a gifted strategist and has, on multiple occasions, successfully commanded ragtag teams of students against larger and often better equipped forces. Each Main Story Volume features at least one instance of the focus club, such as the Foreclosure Task Force, the Game Development Club or even the Arius Squad in V3C4, while being led by Sensei, commenting on how much easier their fights are with Sensei in command. This gets taken to another level in Vol. F when they have to command six squads at the same time to simultaneously destroy the six False Sanctums against Color-hijacked raid bosses while managing the citizens' safety.
• Tragic Keepsake: Following the events of Final Volume, Sensei keeps hold of Phrenapates' Adult Card, damaged beyond repair and with only a sliver of its power left. Players have the option to either keep the card intact as a memento of the event, or extract its power, which rewards the player with 1200 Pyroxene, but causes the card to crumble to dust.
• Universally Beloved Leader: By the time of Schale's Happy Valentine Patrol, Sensei has a couple of citizens thanking them for their hard work bettering Kivotos, Sena likewise doing the same on behalf of the students. Volume F shows they've garnered so much trust amongst the student councils that everyone who attended Rin's emergency meeting makes it clear they're only there because of Sensei rather than the GSC.
• Willfully Weak: Sensei's credit card is very powerful that simply taking it out during Volume 1 threatened Black Suit so much he went into minor Villainous Breakdown. The only reason why Sensei didn't use it more often is because it is powered by their "time" and "life". When Sensei finally used it during the event of Volume 3, Sensei is shown capable of defeating Angelic Abomination using its power.
• Workaholic: is constantly pulling all-nighters to get their work done to the point of falling asleep on their desk.

Arona

Thanks for the hard work Sensei.

Affiliation: SCHALE

Age: N/A

Birthday: N/A

Height: N/A

Hobbies: N/A

Illustrator: Hwansang

Voiced by: Konomi Kohara

A quirky but plucky AI found in the Shittim Crest. Not much else is known other than her being responsible for running the Chest's functions.

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• Affectionate Gesture to the Head: Clearly enjoys getting 'headpats' when you tap her head on the campaign screen.
• Benevolent A.I.: She's more than happy to help you figure out the Shittim Chest and how to optimize your interactions with the students.
• Brain Uploading: She's in fact the GSC President uploaded and digitized into the Shittim Chest's OS to replace Plana, the intended OS for ALL Shittim Chests.
• Chekhov's Gunman: Arona intially is portrayed as the game's mascot and the Sensei's AI assistant. However, the afterword of Volume F confirms without a doubt that Arona is actually the missing General Student Council President.
• Cool Big Sis: She tries to get Plana to call her "Sis" in VFC4 Ep. 8, but Plana just calls her "Arona". The JP dialogue similarly has Arona declare herself as Plana's big sister, but Plana instead calls her "senpai", much to her dismay.
• Deflector Shields: As part of power of the Shittim Chest, Arona can erect a protective barrier around the Sensei to protect them from outside threats like gunfire. The one time she couldn't is during Volume 3, Chapter 3 when Arona exhausted most of her power protecting Sensei from Arius's missile destroying the cathedral, then shut down, leaving Sensei vulnerable to Saori's shot.
• Hello, [Insert Name Here]: If given a pronunciation guide, Arona will address the player by name.
• Identical Stranger: As the story progresses, it becomes increasingly clear that Arona bears a striking resemblance to a younger version of the General Student Council President.
• Invisible to Normals: Arona's voice cannot be heard by anyone except Sensei. The only exception to this was when they came face to face with the other AI in Phrenapates's damaged Shittim Chest.
• Light Is Good: Her color scheme is primarily that of pure white and sky-blue colors as befitting of the game's title. Of course, she's a sunny ball of goodness to match too.
• Living Mood Ring: Unlike the students, her halo is unique in that it changes shape and color according to her mood. So far, there's the normal blue halo, a purple dripping halo when she's sad, a peach pink heart when she's happy, a jade green halo with winking stars when motivated, an electric blue haze when she's shocked, and crown of orange spikes when angry.
• No-Sell:
  • Decagrammaton tried to hack the Shittim Chest. Arona was asleep on her desk at the time, and murmured in her sleep that it 'tickled' before kicking Decagrammaton out with such force that it shook the building Sensei and the others were in. Decagrammaton's reaction says it all.
  • Likewise, when Kaiser steals the Shittim Chest and tries to hack it, it ends up getting their own servers destroyed, even though Arona is shut down and not conscious.
• Oh, Crap!: Tapping Arona on the campaign menu when she's sleeping causes her to freak out upon waking up.
• Talking in Your Sleep: Arona tends to mumble about food when sleeping.

Plana (Spoilers for Volume F)

A.R.O.N.A/Plana

Affiliation: SCHALE

Age: N/A

Birthday: N/A

Height: N/A

Hobbies: N/A

Illustrator: DoReMi

Voiced by: Konomi Kohara

A black-colored version of Arona that manifested from the damaged Shittim Chest Phrenapates owns, she possesses virtually the same capabilities as Sensei's Arona, and assist both Phrenapates and Shiroko*Terror in their invasion of Kivotos.

After Phrenapates's death and the collapse of the Ark of Atrahasis, she is transferred into Sensei's Shittim Chest because of a request Sensei made to Arona. As Sensei continues to fall from a height of 7000m, she joins hands with Arona in order to perform a miracle that helps them survive the landing safely. While she planned to leave after saving Sensei, Arona catches up to her, give her the name Plana in order to differentiate them both, and convince her to stay at Sensei's side in the Shittim Chest.

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• Alternate Self: Averted. While Arona and Plana do share some similarities and are both Shittim Chest AI, they're in fact not the same existence, and the reason for their differences is because Arona is actually the GSC President, while Plana is presumably what the original Shittim Chest AI would have been.
• Alternative-Self Name-Change: Was given the name Plana by Arona, as she was also called Arona before then. In cutscenes, her name is written as A.R.O.N.A to differentiate the two.
• Call-Back: The moment she manifested, she introduces herself in a manner that mirror the self-introduction line Arona gave to Sensei right after they asked for her name during the Prologue.
• Dark Is Not Evil:
  • Subverted at first; she's a counterpart to Arona who dons a pitch-black uniform and coat who's assisting in the destruction of Kivotos, although it should be noted that she's only following Phrenapates's orders rather than doing it out of any malice. It's played straight after their defeat, helping to save Sensei from falling out of the Ark and now residing in the Shittim Chest as a helpful virtual assistant.
  • As your Shittim Chest's new AI, her appearance is signaled by a muted lavender and red loading screen instead of Arona's cyan and pink theme, and in the stage selection screen after, she appears in the ruined classroom while the skies are turning dark and stars start to dot it.
• Deadpan Snarker: She's much more blunt and deadpan than Arona.
• Defeat Means Friendship: She was previously affiliated with Phrenapates, but is convinced by Arona to join Sensei after Phrenapates is defeated.
• Emotionless Girl: Compared to Arona, she's much more quiet and reserved and less prone to showing any emotion.
• Foreshadowing: All the way back to the 1st Anniversary 3rd PV; the introductory blackboard has a red chalk drawing of A.R.O.N.A's glowering face.
• Hates Being Touched: She'll malfunction if you poke her on the screen too many times.
• Japanese Honorifics: Her JP voice lines has her address Arona as senpai, rather than onee-chan like her counterpart AI wanted.
• Living Mood Ring: Like senpai AI Arona, Plana's halo changes shape according to her mood, except the color stays in different shades of red rather than altogether different colors (except for when she's happy, which is the same peach shade as Arona's).
• Not So Above It All: Implied with the Pyroxene purchase icons, where the first of the last two packages has her in a swim ring amongst a sea of Pyroxenes, while the last has her wearing shades and posing alongside Arona.
• Red and Black and Evil All Over: She wears black clothes and has a red halo, also accompanied by red triangle particles, though the evil part is debatable given that she's only going along with the Chroma's invasion for Phrenapates's sake initially, then subverts it once she's gone over to Sensei after their defeat.
• Red Oni, Blue Oni: Color scheme aside, she's the blue to Arona's red.
• Tsundere: She clearly enjoys being shown affection by Sensei, but tries to hide the fact.