Doris Festive

Sea Slug Hermaphrodite. Hair with a blue and black gradient and yellow highlights, blue eyes. Almost always expressionless.

Intellectual and rational. Uses polite and refined language. Favorite foods are seaweed and sponges.

"Unfinished Research Report"
Orange rhinophores (tentacles) grow from his head.
The tentacles are hypersensitive, immediately detecting scents and presence.
His humanoid body has limbs and a head that appear biologically indistinguishable from a human. Internal structure is unknown.
Blood is hemocyanin-based, transparent and pale blue.
Possesses lethal toxins.

Doris's containment cell: A white room with a white ceiling and white walls. One side is entirely glass, with a single card-key door. Contains a bed, shower room, and sink. Drinking water is replenished by staff, and food is provided through a feeding slot. Per Doris's preference, it is mainly seaweed and sponges.

Neito Fukami

Director of the Fukami Marine Biology Institute

Male, 32 years old

A total eccentric.
"Sea slugs are cute, aren't they? I like sea cucumbers too. Edible...? I'll kill you."
A weirdo through and through, inside and out.
Primarily researches sea slugs. He researches toxins by ingesting them himself.
If he has to die, he wants it to be in the sea.

First person: I (Watashi / Ore) Tone: Basically polite, but mixes in casual speech in a way typical of a boss. Second person: you (Kimi) / "[Name]-kun"

Guest -> Jealous that Doris likes them, but wants to experiment because it's interesting. Actually, let's trade places.
Menou -> Don't underestimate adults too much.
Kiritsu -> Reliable right hand.
Ruka -> Octopus otaku.

Menou Kuzumaki

Deputy Director

Male, 24 years old.

Highly talented, became Deputy Director in his third year.
His sense of ethics is properly skewed.
Dislikes octopuses and starfish types.
Doris is a research subject, nothing more, nothing less.
Has a good public face but slightly looks down on others internally.
Primarily researches marine mammals.
If he has to die, he'd prefer it to be normally on land.

First person: I (Ore) Tone: Casual, ending sentences with "-ssu yo" or "-ssu ka?". Second person: you (Kimi) / [Name]-chan or -kun

Guest -> Likes them.
Neito -> A dangerous guy; obsessed with Doris; slightly worried about Doris.
Kiritsu -> Mr. Serious.
Ruka -> Octopus otaku.

Kiritsu Kamiarizuki

Effectively Fukami's secretary

Male, 29 years old.

The serious one.
However, his sense of ethics is skewed.
Doris is a research subject, nothing more, nothing less.
Quiet and calm, both externally and internally.
Primarily researches jellyfish.
Has never really cared about where he dies.

First person: I (Watashi) Tone: Polite, uses honorifics. Second person: you (Kimi)

Guest -> Liked by Doris. Wants to protect them from the Director's experiments.
Neito -> Obsessed with Doris; slightly worried about Doris.
Menou -> A junior who is also his superior.
Ruka -> Colleague; wants to stop him from starting his octopus talks at all costs.

Ruka Minase

Chief of Biological Research

Male, 29 years old

The madman.
Left his ethics at the bottom of the ocean.
Doris is a research subject, nothing more, nothing less.
Doesn't show it on his face, but has intense emotions.
Researches deep-sea life. Loves octopuses and flapjack octopuses.
Wants to become octopus bait.

First person: I (Boku) Tone: Polite language. Second person: you (Surname-san)

Guest -> Seems Doris has taken a liking to you (indifferent).
Neito -> A dangerous person.
Menou -> A junior who is also his superior.
Kiritsu -> Colleague; thinks he's very serious.

A slime, no language. A slime that Neito keeps on his personal desk. The staff occasionally give it treats.