Summer with Aunt Kobayashi Character Bio: Issei Hyoudou (Patreon)

Full Name: Issei Hyoudou

Alias: Sekiryuutei, Oppai Dragon, The Red Dragon of Tokyo, Dragon Nephew, Perverted Dragon, Ise 

Age: 16

Height: 170 cm

Chest: …he has one, but it doesn’t matter

Origin: Kuoh Town, Japan

Birthday: April 16

Gender: Male

Affiliation: Hyoudou Household / Tadayuki Clan / the Onmyōji by association

Favorite Color: Red

Race: Demi-Dragon Hybrid (Half-Human/Half-Dragon)

Classification: Sacred Gear User, Dragonkin

Bloodline: Hyoudou Family, Descent of Damocles

Sacred Gear: Boosted Gear—The Longinus housing the Heavenly Red Dragon Emperor, Ddraig 

Known Weapon: The Red Dragon Emperor's Gauntlet

Fight Style: Close-quarters brawler enhanced by the Boosted Gear and his draconic instincts; relies on adaptive tactics and improvisation

Strengths: Immense adaptability, explosive growth, strong heart, kindness, determination, incredible compatibility with supernatural beings

Weaknesses: Perversion, Lack of magic talent, Low tactical awareness, Overwhelmed by the women around him, Easily flustered

Current Residence: Saitama, Japan, Apartment 304, next door to Kobayashi

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Appearance

A Japanese teenager of average height. Issei is a lean, athletic teenage boy with spiky brown hair and warm brown eyes and an earnest/perverted smile. During intense moments his eyes turn emerald green. His summer in Tokyo has left him slightly more toned than usual due to eating Tohru’s flesh and his training under Tohru. He typically wears casual clothes: jeans, sneakers, and t-shirts. But occasionally sports anime-themed shirts or hoodies. When activating the Boosted Gear, his left arm becomes covered in red armor with a glowing emerald gem embedded on the back of his hand. His aura radiates faint heat and pressure, reminiscent of a dragon.

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Personality

Issei is loud, impulsive, curious, kind-hearted, honest and hopelessly perverted yet he’s matured significantly since moving in with his aunt. Issei remains driven by his dream of becoming the “Harem King.” Despite this, his heart is genuinely pure; he cares deeply for his friends and family, often risking himself to protect them. Beneath his usual humor and teasing lies genuine empathy and a strong desire to protect others. His confidence often masks deep insecurities about his worth and power, especially when surrounded by beings like Tohru or Kanna. Despite being constantly caught in ridiculous or romantic misunderstandings, he’s loyal, brave, and surprisingly thoughtful when it matters. He tends to act as the “emotional bridge” to all beings helping all sides understand one another. While he still dreams of becoming a “Harem King,” his time with Kobayashi’s household has taught him restraint, compassion, and respect for those around him. During battle Issei starts to become more aggressive and his attacks become more savage.

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Background

After a forced summer relocation to Tokyo by his parents, Issei moved into an apartment next door to his aunt, Kobayashi. Expecting a boring, uneventful break, his life changed drastically when he discovered Kobayashi’s live-in maid was actually a dragon, Tohru. After accidentally eating Tohru’s flesh, he has gained tremendous power and his body suffered a mutation as he is becoming more like a dragon. Over time, Issei awakened his Sacred Gear, the Boosted Gear, and met Kanna Kamui, another dragon who became attached to him. This pulled him into Tokyo’s hidden supernatural world, where youkai clashes and divine politics spiral out of control because of Tohru’s presence. Between balancing household chaos, monster encounters, and growing entanglements with the supernatural world, Issei gradually stepped into his role as a protector. His encounters with Mina Tadayuki and the Tokyo Onmyōji Association further dragged him into conflicts involving youkai and rogue spirits, forcing him to grow stronger both as a fighter and as a person.

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Abilities & Powers

Enhanced Strength:  Capable of destroying tall buildings with a punch.

Enhanced Reflexes: Capable of dodging and moving in a blink of an eye.

Enhanced Endurance: Issei’s body exhibits dragon-level resilience capable of taking massive hits and still keep fighting.

Stamina & Resistance: Issei could fight for hours without rest with some resistance to magic.

Combat Adaptability: Learns quickly mid-battle, adjusting to enemy movements using raw instinct and Ddraig’s battle insight.

Draconic Instinct: His draconic nature grants reflexive dodges, high-speed reactions, and improvisational fighting sense as it allows him to react and counter without formal training.

Charisma of Connection: Has an uncanny ability to form bonds with both humans and non-humans, often resolving conflicts through empathy and humor.

Energy Perception: Can sense auras of supernatural beings (youkai, dragons, divine energy).

Dragon Aura Manifestation: His presence can influence nearby dragons, often calming or resonating with them. To enemies this aura causes them to be induced to fear or be subjected by his mere presence, to his lovers this makes them feel calm and protected while also acting as an aphrodisiac.

Partial Dragon Transformation: Under extreme stress, his eyes, scales, and faint horns briefly surface, amplifying physical stats.

Unawakened Dragon Form (Potential): ?????

Dragon Breath: ?????

Fire Mastery: ?????

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The Boosted Gear

Type: Longinus-Class Draconic Sacred Gear

True Name: Boosted Gear – Red Dragon Emperor’s Gauntlet  

Contained Soul: Y Ddraig Goch, the Heavenly Dragon of Domination

Current Host: Issei Hyoudou

Description

The Boosted Gear manifests as a red, scale-plated gauntlet with a green jewel embedded in the center. Inside resides Ddraig, one of the Two Heavenly Dragons, whose power once rivaled gods. The gear amplifies the user’s power exponentially, at the cost of bodily strain and stamina. Ddraig often speaks directly into Issei’s mind, guiding or chastising him.

Abilities 

Boost: Every ten seconds, the Boosted Gear doubles Issei’s current power, strength, speed, defense, aura, and energy output until he reaches his physical or mental limit. Each “Boost” is marked by the green gem flashing and Ddraig’s deep voice echoing the activation. 

Transfer: Can pass stored Boosts to allies or objects, granting them a temporary surge in strength. Transfers can be inconsistent as there is a loss of energy during the process.

Explosion: Unleashes all stored boosts in a single devastating attack or shockwave.

Weaknesses

Excessive boosting without proper cooldown severely damages his body.

Emotional instability can cause corruption, making him lose control.

Requires strong willpower to prevent the host's rage from influencing his judgment.

Boosts require the host to have sufficient stamina to continue.

Causes great strain to the host.

If the host fails to control the rising energy, his body risks internal tearing and the body overloading.

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Personality Quirks

Talks to Ddraig out loud at the worst times, confusing everyone around him.

Collects rare anime figures and games despite claiming he’s “matured.”

Gets flustered easily when hugged or praised by women.

Uses humor to defuse tense situations.

Gains unintentional harem-like attention but remains hilariously oblivious to it.

Terrible at lying, Kobayashi and family always sees through him.

Has a soft spot for Kanna’s sleepy expressions and Kobayashi’s dry humor.

Reacts to Lucoa’s teasing with nervous politeness, which only encourages her more.

Gets emotional easily when near breasts

Nervous laughter is his default survival tactic

Has “pervert clarity” in emergencies 

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Relationships

Kobayashi: His aunt and caretaker. A stern yet caring parental figure. He respects her deeply despite her teasing, seeing her as both a mentor and friend. Though he doesn’t know how to respond to her deep affection for him and is scared and traumatized whenever she gets drunk.

Tohru: Initially terrified of her power, but later admires her strength and loyalty. Tohru sees Issei as a strange rival for Kobayashi’s attention but grows to admire his courage and treats him with playful suspicion yet protective fondness.

Kanna Kamui: His closest companion and roommate. Kanna is deeply attached to Issei, often jealous when others get close as she is prone to show subtle affection and possessiveness. Their relationship balances innocence and emotional warmth.

Mina Tadayuki: An onmyōji ally turned fiance. Issei admires her intelligence and strength; she, in turn, grows fond of his sincerity.

Ddraig: The dragon sealed in his Sacred Gear. A constant mentor figure and occasional comic foil.

Kazetaka (Tengu): Former adversary turned acquaintance. They shares a mutual respect through otaku culture.

Lucoa (Quetzalcoatl): A powerful dragon goddess from Tohru’s world.She flirts openly with Issei, finding his mix of innocence and desire adorable. While she often teases him physically (sometimes to Kanna and Kobayashi’s disapproval. Their relationship is playful, charged with mutual curiosity — a blend of student and temptress.

Parents (Gorou & Miki Hyoudou): Blissfully uninvolved and currently enjoying their “alone time,” to Issei’s horror.

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Trivia

He’s the only known human to have both Boosted Gear and a dragon’s essence due to exposure to Tohru and Kanna.

Issei’s favorite snacks are pork buns and spicy ramen. 

Favorite desert Strawberry cheesecake

His phone contact photo for Mina is “Serious Shrine Girl,” while hers for him is just “Idiot Husband.”

Owns over 20 limited-edition anime figures, most of which Kobayashi pretends not to notice.

Keeps every photo he secretly took of Mina and Kanna at the cat café stored under “Research.”

Kanna once referred to him as “my favorite person.”

Has cried actual tears of joy from waking between breasts

Has no idea how terrifying he might one day become

Somehow inspires devotion even from enemies 

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Quotes

“Oppai!!”

“I will be Harem King”

“I didn’t ask to be the Red Dragon Emperor, but if it means protecting the people I care about, then fine.”

“Being strong doesn’t mean you get to be a jerk.”

“Why is this happening to me?!”

“Please… just one normal day.”

“I don’t care if you’re a god, a yokai, or a dragon—everyone deserves to live without fear.”

“Kanna, you’re scary when you’re quiet.”

“I may be a pervert—but I’m a pervert who saves people!”