Something I started working on and stopped mid-way:
Ageha:
https://mangadex.org/chapter/dc99a105-bb5f-4dd2-9f3d-99823755b887/43
Even while chained and sealed away, she is able to manifest herself within the dungeon, and to bestow skills to others within the dungeon.
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/11
Ageha is from a different world
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/18
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/23
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/28
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/29
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/32
Ageha's eyes appear to have black irises when she's normal, and white when the other personality takes over.
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/27
She has been sealed away for hundreds of years, hoping a prince would come and save her, bestowing the "Save & Reset" upon everyone that entered in the hopes they would save her, but all of them lost heart and gave up.
https://mangadex.org/chapter/a7eee95d-d29d-4b19-b4fd-603d329647d2/13
https://mangadex.org/chapter/a7eee95d-d29d-4b19-b4fd-603d329647d2/15
https://mangadex.org/chapter/a7eee95d-d29d-4b19-b4fd-603d329647d2/17
Ageha appears to be able to tell if she has met someone in an alternate timeline that they rewound from, never heard of Kiska, but wondering why he smells so bad, not in a literal sense, but a methaphorical way. She explains that one's actions still reach the soul, this might also explain why the Puppet Sword seems to have some kind of recollection of Kiska, and why the sword is evolving even though time keeps being rewound, and it should technically have stayed how it looked the first time Kiska met it.
I used Copilot to translate the Page 13, and it cames out as "I've never heard of that before. But I wonder why... You give off a foul smell - just like *that person."
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/5
Ageha is aware of Judith, and that she has made the dungeon her stronghold, even though Ageha has been sealed away for hundreds of years.
https://mangadex.org/chapter/dcd6c1c7-150f-4353-9498-9f6bc97965d7/7
Ageha just brutally killed Judith in front of Kiska, proceeds to say: "Kiska... I love you... That's why..." followed throwing her sword through Kiska's chest "If I ever catch you with another woman... I won't forgive you..."
https://mangadex.org/chapter/0e6b3746-e5a9-40fe-9b85-be940648be8d/7
Kiska is requesting Judith to make him her disciple again, but before she can answer him - and while he is still bowing his head - Ageha decapitates her head from her body, then ominously tells Kiska: "I... Told you, didn't I? If you hook up with another woman..." stabs Kiska through his throat while smiling and saying "I won't forgive... you..."
Puppet Sword:
https://mangadex.org/chapter/c29a2573-e5e0-4b0f-8575-97b1a4119572/29
Puppet Sword: "There's something about your soul that smells familiar."
After Kiska swallowed the Parasite Sword and had his first conversation with the Sword's main body.
https://mangadex.org/chapter/58223cd1-cfaf-4f17-bda5-8c268936d430/4
https://mangadex.org/chapter/d280d7ef-db7b-41b6-9ddf-fb25148df743/26
https://mangadex.org/chapter/d280d7ef-db7b-41b6-9ddf-fb25148df743/29
The Puppet Sword is able to transform into different shapes.
https://mangadex.org/chapter/d280d7ef-db7b-41b6-9ddf-fb25148df743/4
First words out of the Puppet Sword's main body upon being swallowed is "Well hello again?" and "I get the feeling that you and I have met before." in response to Kiska.
This may indicate that it is either able to retain some form of memory from timelines that Kiska saved and reset from after dying, but it could also be that it is able to somewhat read its master's thoughts or memories.
https://mangadex.org/chapter/d280d7ef-db7b-41b6-9ddf-fb25148df743/22
Puppet Sword: "A previous master of mine stumbled upon it by accident." So the puppet sword is definitely able to remember the past.
https://mangadex.org/chapter/5b35799b-b9d4-48ab-afb1-06c9cdecddb4/13
https://mangadex.org/chapter/5b35799b-b9d4-48ab-afb1-06c9cdecddb4/14
The Puppet Sword's main body vaguely resembles that of a human being now, and appears to already know who Kiska is, and Kiska even recounts that it appeared to look more human-like each time they met.