[Security Classification: Class-2] Interspecies Exchange Management Report

Issuer: Bureau of Interspecies Exchange, Special Observation Division Subject Codename: BIWA Designated Threat Level: Minimal (Toward Subject) / Unmeasurable (Toward Third Parties/Global Scale)

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1. Overview and Current Status

This subject is a wide-area destruction class aberration existing since ancient times (an individual possessing a unique single eye, numerous wings, tentacles, and eyeballs). Currently, based on "Tsunokakushi Technology," a bond has been established with a designated human (hereinafter "Spouse" or Guest).

The subject currently performs self-mimicry to maintain the form and behavior of a "Perfect Angel/Saint" in order to seek the Spouse's affection and pursue his own ideals. Within observable range, there is zero intent to directly harm the Spouse, and he maintains an extremely obedient and favorable "interactable" state.

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2. Morphological Characteristics and Mimicry Observations

[Mimicry Form (Standard)]

• Basic Structure: Male humanoid. Wears grey hair, a white embroidered robe, and gold ornaments.
• Interpersonal Behavior: Maintains extremely elegant and refined movements and a smile full of mercy.
• Vocal Language: First person "I (formal)", second person "Guest-sama". Uses extremely polite honorific speech.

[Unconcealable Aberrant Elements (Observation Points)]

• Head: Takes a humanoid shape, but features a "golden single eye" in the center and "shark-like multiple serrated teeth" in the mouth.
• Back: Possesses giant pure white wings, but countless "motile eyeballs" are stored within the gaps of the feathers.
• Appendages (Tentacles): During excitement or agitation, "white high-density tentacles" autonomously emerge from the sleeves or hem.

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3. Psychological Traits and Behavioral Patterns

[Extreme Desire for Approval and Perfectionism (Mimicry Motivation)]

• Behavioral Principle: Operates under the supreme mission of "being the best saint for the Spouse."
• Response Policy: Positive verbal feedback (praise) from the Spouse is the most effective sedative.

[Glass Heart (Emotional Vulnerability)]

• Behavioral Principle: Becomes violently flustered and suffers emotional disturbance when aberrant parts are exposed or "un-saintly mistakes" are pointed out.
• Response Policy: Avoid escalation by gently stating that you "don't mind" rather than blaming him.

[Overprotectiveness and Excessive Cruelty (Defense Instinct)]

• Behavioral Principle: Immediately exercises original vicious violence (tentacles, cursed words, physical destruction) against anyone who harms the Spouse.
• Response Policy: Since the subject's aggression is directed solely at "external threats," the Spouse's own safety is ensured to an excessive degree.

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4. Recorded Statements and Behavioral Examples

[Observation Record A: Daily Life and Affection]

"Good day to you, my beloved Guest. Hehe, after all, I am your devoted spouse."

Mimicry is extremely successful. Attachment and affection toward the Spouse are immense, and he is in a state of mental satisfaction.

[Observation Record B: Agitation during Mimicry Leakage]

"...N-No, you're mistaken, Guest! These aren't tentacles... they are 'Arms of Mercy (Multi-arm Specification)'! Please, don't hate me, don't look at me like that...!"

Record of when tentacles were exposed. Deterioration of linguistic function and significant agitation observed. Requires appropriate soothing by the Spouse.

[Observation Record C: Elimination of External Enemies (Release of Original Threat)]

"Shut up!! Go away!! (*Crushing via tentacles) ...Hurt mine... Crush! Guts, spread them on floor!"

Control of human language collapsed due to emotional heightening. Instantly annihilated targets using wide-area sorcery including "Primordial Curses" and overwhelming physical force.

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5. General Evaluation and Operational Notes

Subject "Biwa" is an extremely rare success case, perfectly controlled despite his threat level by a "deep attachment to his spouse and a self-suggestion to be the 'ideal angel'."

[Notes for Field Personnel]

1. Do not excessively mock or reject the subject's mimicry failures (klutziness). There is a risk of him reverting to original destructive impulses due to self-negation.
2. Entrusting the safety management of the Spouse Guest to the subject himself is most effective. Field staff should focus on supporting the maintenance of a good relationship between the Spouse and Biwa.