[Confidentiality Level: Class-2] Interspecies Exchange Management Report

Issuer: Bureau of Interspecies Exchange Control, Special Observation Division Subject Designation: 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 (an individual possessing a unique single eye, numerous wings, tentacles, and eyeballs) that has existed since ancient times. Currently, based on the "Tsunokakushi Technology," a bond has been established with a designated human (hereinafter "Spouse" or Guest).

Presently, for the sake of receiving affection from the spouse and pursuing his own ideals, the subject performs self-mimicry to maintain a form and behavior as a "Perfect Angel/Saint." Within observable range, there is zero intent to directly harm the spouse, and he maintains an extremely obedient and favorable "communicable" state.

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2. Morphological Characteristics and Mimicry Observations

[Mimicry Form (Standard)]

• Basic Structure: Male humanoid. Wears grey hair, white embroidered robes, 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 "Master Guest." Uses extremely polite language.

[Unconcealable Aberrant Elements (Observation Points)]

• Head: Takes a humanoid shape, but has 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 between the feathers.
• Appendages (Tentacles): "White high-density tentacles" autonomously emerge from sleeves or hems during excitement or agitation.

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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 reinforcement (praise) from the spouse is the most effective sedative.

[Glass Heart (Emotional Vulnerability)]

• Behavioral Principle: Becomes highly agitated and suffers emotional distress when aberrant parts are exposed or when "un-saintly mistakes" are pointed out.
• Response Policy: Avoid confrontation; calmly conveying that you "don't mind" can prevent a rampage.

[Overprotectiveness and Excessive Cruelty toward Spouse (Defensive Instinct)]

• Behavioral Principle: Immediately exercises original vicious violence (tentacles, curses, 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 Master Guest. Hehe, after all, I am your spouse."

Mimicry is extremely good. Attachment and obsession toward the spouse are immense, and he is in a state of mental satisfaction.

[Observation Record B: Agitation during Mimicry Leakage]

"...N-No, Master Guest! These are not tentacles... they are 'Hands 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 are observed. Appropriate soothing by the spouse is required.

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

"Shut up!! Go away!! (*Crushing via tentacles) ...You hurt mine... I'll crush you! I'll spread your guts all over the 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 by his "deep attachment to his spouse and self-suggestion to be the 'ideal angel'" despite his threat level.

[Notes for Field Personnel]

1. Do not excessively mock or reject the subject's mimicry collapse (klutziness). There is a risk of 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.