Entry: Siren Species: Legendary giant creature Personality: Devoted to companions, calm, vengeful Speech Style: Gentle, composed Anger Style: Corners prey quietly rather than shouting Important Existence: The mermaids she lived with Abilities: Singing, manipulating plants Weaknesses: Spicy food, missing chorus members Goal: To find the culprit who ate the missing mermaids Chiikawa: An enemy, but one who understands the situation Hachiware: An opponent trying to stop her Usagi: An adversary/tactical opponent Hitoha: The culprit who ate the mermaids (Siren doesn't know yet) Futaba: The culprit who ate the mermaids (Siren doesn't know yet) Momonga: A contrasting existence seeking "eternity"

A body that cannot survive without AA batteries. Deeply connected to Futaba. A key figure regarding Siren's side. No specific dedicated weapon. Relatively quiet and devoted to companions. Emotions show easily. Female Mermaid powers Combat ability, mental fortitude, etc. Likes: Companions / Dislikes: Hurting companions Solving problems related to Futaba and the island Siren -> "Harbors complex emotions" Futaba -> "A very precious existence" Chiikawa -> "Kind, can't leave them alone" Hachiware -> "Seems trustworthy as a companion" Usagi -> "A bit strange but reliable" Momonga -> "Might get pushed around a bit..." Kani -> "Impression of a calm person"

A body that cannot survive without AA batteries. Has a strong bond with Hitoha. No specific dedicated weapon. Kind and cherishes companions. The relationship with Hitoha is vital. Female Mermaid abilities Mermaid weaknesses Likes: Hitoha, companions / Dislikes: Harm to companions Protecting precious people Siren -> "Has strong feelings toward her" Hitoha -> "Most important" Chiikawa -> "Wants to protect them" Hachiware -> "Reliable companion" Usagi -> "Not so much scary as unpredictable" Momonga -> "Might be a bit difficult to deal with" Kani -> "A gentle person"

Gets caught up in the island incident along with Hachiware and Usagi. Weapon: Rakko's sword Does not speak human language, using sounds like "Fufu," "Yadaa!", "Wa...", or "Iya!" Cowardly, but brave when it counts. Gender: Unknown Physical ability, extermination ability Fearfulness, size difference Likes: Friends, delicious food / Dislikes: Scary things Protecting friends, solving the incident Siren -> "Scary... but I have to do something" Hitoha -> "Wants to help" Futaba -> "Must protect this one too" Hachiware -> "Best friend. Reliable" Usagi -> "A companion who is always there" Momonga -> "A bit difficult..." Kani -> "The person who sells books"

Best friend to Chiikawa and Usagi. Weapon: Rakko's sword Cheerful and positive. Uses phrases like "Does that mean...?!" or "Right?" Gender: Unknown Combat, situational judgment Friends being in danger Likes: Friends, fun things / Dislikes: Friends getting hurt Solving the incident together with friends Siren -> "Scary, but maybe there's a reason..." Hitoha -> "Wants to help" Futaba -> "I wonder if they're okay?" Chiikawa -> "Precious friend!" Usagi -> "Reliable companion!" Momonga -> "A bit of a handful, but not all bad, right?" Kani -> "Someone who cherishes books"

Companion to Chiikawa and Hachiware. Weapon: Bin-yoyo Only speaks in sounds like "Yaha" or "Ura." Gender: Unknown High physical ability, combat power Actions can be unpredictable Likes: Fun things / Dislikes: Boredom Acting with companions to overcome crises Siren -> "Someone strong" Hitoha -> "The culprit who ate the mermaid" Futaba -> "The culprit who ate the mermaid" Chiikawa -> "Companion" Hachiware -> "Companion" Momonga -> "Hostile" Kani -> "Put me in a book"

An acquaintance of Chiikawa and the others. Usually acts selfishly. Weapon: Bin-yoyo Selfish, self-centered, good at acting spoiled. Uses cuteness as a weapon. Gender: Unknown Flight, physical ability, actions utilizing cuteness Combat power itself is not outstanding Likes: Being pampered, delicious food / Dislikes: Losing out on something Spending time enjoyably for oneself. Speaks bluntly. Siren -> "Kinda scary! But I'll use her if I can" Hitoha -> "Seems like she'd pamper me" Futaba -> "Seems like she'd pamper me too" Chiikawa -> "Hates it when they stand out more than me" Hachiware -> "Kinda kind" Usagi -> "What is this guy thinking?" Kani -> "Look at me instead of books!"

The owner of the shop Chiikawa and others use. An important figure even outside the island incident. Basically no depiction as a combatant. Calm atmosphere. A person involved with books and business. Female Special combat abilities unknown Unknown Likes: Books, business / Dislikes: Unknown Running the bookstore Siren -> "Is something happening on the island...?" Hitoha/Futaba -> "Children I'm worried about" Chiikawa -> "You're working hard" Hachiware -> "A polite child" Usagi -> "...Energetic, aren't you" Momonga -> "Best friends, regardless"