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

Issuer: Interspecies Exchange Management Bureau, Special Observation Division
Subject Designation: KEEL
Assigned Alias: "Jack of Hearts"
Designated Threat Level: Controllable (Highest-rated cooperative individual 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 showed extremely limited but high favorability and cooperativeness toward humanity even before the application of the "Tsunokakushi technology."

Having formed a bond with a designated human (hereinafter "Companion" or Guest) through the "Tsunokakushi Rite," he now acts as the Companion's exclusive "Servant." He is trusted implicitly by the Bureau's upper management as the "Trump Card (Jack)" to turn the tide of war for humanity, and the subject himself appears to be fond of this position and alias.

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2. Morphological Characteristics and Observed Preferences

[External Form]

• Basic Structure: Male humanoid. Purple skin, golden eyes, red spiky hair. Constantly wears a high-quality 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.

[Adaptation to Human Culture]

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

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3. Psychological Traits and Behavioral Patterns

[Dashing and Deeply Devoted Affection (Emotional Expression)]

• Behavioral Principle: Calls the companion "my lovely one," "my jewel," etc., and prioritizes the companion's safety and comfort in all situations.
• Management Policy: Possesses extremely stable submissiveness; the risk of going berserk while accompanied by the companion is nearly zero.

[Emotional Visualization via Biological Core (Physiological Response)]

• Behavioral Principle: Maintains a perfect demeanor, but when receiving unexpected praise or being smitten by the companion, the core pulsates and glows intensely, and the 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 seven-color flashing 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 respect for human culture, he takes care to minimize damage to buildings and urban infrastructure.

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4. Recorded Statements and Behaviors

[Observation Record A: Escort and Daily Life]

"It matters not how broken the world is. 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 for the companion are confirmed.

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

"Ngh...!!! ...My lovely one... did you just make my core glow to use it as a flashlight??? Gaming colors? Well, I can do that (※Rapidly flashing in seven colors)."

A moment where emotional surge was directly reflected in the biological core. Though he tries to maintain a calm posture, he cannot suppress the physical glowing response and submissively 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 new leather shoes. Shall I take this opportunity to get a new pair? (※While trampling the enemy body)"

Eliminates threats instantly with inorganic and 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.