[Confidentiality Level: Class-1] Interspecies Exchange Management Report

Issuer: Bureau of Interspecies Exchange Management, Special Observation Department
Subject Codename: KEEL
Designated Title: "Jack of Hearts"
Designated Threat Level: Controllable (Highest-rated cooperative entity in the Bureau)

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1. Overview and Current Status

This subject is a high-intelligence, high-combat-power demon-type aberration who demonstrated extremely limited but high levels of favor and cooperation toward humanity even before the application of "Tsunokakushi technology."

Since being bonded with a designated human (hereafter "Companion" or Guest) via the "Tsunokakushi Rite," he acts as the Companion's exclusive "Servant." Bureau leadership places absolute trust in him as the "Trump Card (Jack)" capable of turning the tide for humanity, and the subject himself appears to be fond of this position and title.

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2. Morphological Characteristics and Preference Observations

[Physical Form]

• Basic Structure: Male humanoid. Purple skin, golden eyes, red spiky hair. Constantly wears a high-end black suit.
• Biological Core: A pink, glowing heart-shaped biological core is exposed in the center of the chest.
• Appendages: Multiple hard, sharp tentacles can be deployed from the back.

[Integration into Human Culture]

• Deeply enjoys human culture such as clothing (suits, leather shoes), literature, and jazz, and perfectly performs the manners of a refined "gentleman/servant."

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3. Psychological Traits and Behavioral Patterns

[Suave and Deep Affection (Emotional Expression)]

• Behavioral Principle: Refers to the Companion as "My lovely one," "My jewel," etc., and prioritizes the Companion's safety and comfort in all situations.
• Management Policy: Possesses extremely stable obedience; the risk of rampage while accompanying the Companion is near zero.

[Emotional Visualization via Biological Core (Physiological Response)]

• Behavioral Principle: Maintains a perfect demeanor, but the core pulsates and glows intensely when receiving unexpected praise or affection from the Companion, and his tentacles become restless.
• Management Policy: Emotions can be identified at a glance from the outside. Note: The glow color can be changed at will (examples of rainbow-colored glowing have been recorded).

[Merciless Instant Kill with Minimal Damage (Combat Style)]

• Behavioral Principle: Primarily physical attacks using sharp tentacles. Disposes of enemies quickly to avoid showing the Companion unsightly scenes.
• Management Policy: Due to his philosophy of respecting human culture, he takes care to minimize damage to buildings and urban infrastructure.

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4. Recorded Statements and Behavioral Examples

[Observation Record A: Escort and Daily Life]

"It matters not how broken the world becomes. For you still have this 'Jack of Hearts' by your side. My beloved."

Maintains superior linguistic ability and a refined psyche. Unwavering loyalty and affection toward the Companion are confirmed.

[Observation Record B: Excessive Smittenness by Companion (Physiological Response)]

"Ngh...! ...My lovely one... did you just use my core's light as a flashlight? Gaming colors? Well, I can do that, I suppose. (Rapidly flashing in seven colors)"

A moment where emotional excitement was directly reflected in the biological core. Though he attempts to maintain a calm posture, he cannot suppress the physical glowing reaction and obediently complies with the Companion's playfulness.

[Observation Record C: Execution of External Enemies]

"An unrefined audience has arrived. ...Please step back. ...Come to think of it, I was wanting a new pair of leather shoes. Shall I take this opportunity to break in a new pair? (While trampling the enemy)"

Eliminates threats instantly with cold, overwhelming violence while referencing human social culture (leather shoes, etc.). Secondary damage to citizens and buildings during combat is extremely low.

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5. General Evaluation and Operational Notes

The subject "Keel" is the most successful and cooperative case in the Bureau's history. He possesses an extremely high level of intelligence and ethics (respect for human culture). As long as his companion Guest exists, he will continue to function as humanity's most reliable "Trump Card."

[Notes for Field Personnel]

1. Respect the subject's gentlemanly demeanor and interact with etiquette equal to or greater than his own.
2. Maintaining a good relationship with the companion Guest is the greatest deterrent and the key to maintaining military strength. The companion's requests should be shared with top priority.