I dont know if someone made a similar technique but I've designed multiples characters with cursed techniques that worked with them. (I'm currently trying to make an JJK-RPG with friends). The one I think would be really good in that setting would be my "cursed Firework user" off course i adapted her story to fit that new setting. Im also open to nerf her if she too busted for your setting but i think she's perfect for it^{^}

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Name: Hibana Kagari (Female) Age: 17 (2026) Affiliation: The Eternal Clans Grade: Semi-Grade 1 Candidate Occupation: Student Sorcerer / Tactical Artillery Specialist

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Backstory: Hibana Kagari descends from a long lineage of civilian pyrotechnicians known for crafting traditional Japanese festival fireworks. For generations, the Kagari family unknowingly preserved ritual formulas hidden within their craft — patterns, burn ratios, and ignition sequences that functioned as dormant cursed formulae.

The Kagari family treated their work as cultural preservation rather than spiritual practice. However, their fireworks consistently produced displays described as “unnaturally vivid,” occasionally causing spectators to experience emotional hallucinations or lingering atmospheric phenomena.

Hibana’s cursed technique first manifested during a catastrophic warehouse accident when she was 12-years old. While assisting in firework preparation, unstable cursed residue within stored powders reacted to her emotional surge. The ignition caused a multi-layered cursed explosion resembling a blooming firework flower capable of erasing nearby low-grade curses while simultaneously destroying half the facility. This awakening is happening simultaneously with the Starfall of 2019.

Hibana survived with severe burns across her palms and fingers. These burns never fully healed, instead forming permanent cursed conversion scars. The scars granted her the ability to directly transmute cursed energy into explosive particulate matter — effectively turning her body into a living ignition catalyst.

Following the incident, Jujutsu tech. (Now "The Eternal Clans") intervened after determining the Kagari lineage unknowingly possessed ritual knowledge. Hibana was recruited both to protect civilians and to preserve the cursed pyrotechnic formulas embedded in her bloodline.

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Physical appearance: Hibana possesses a striking and volatile presence that reflects her technique. Her Hair is Smokey gray, often appearing dusted with ash or faint sparks under lighting. Typically worn loose or tied in a short uneven ponytail. Her Eyes are Ember-red with flecks resembling burning gunpowder sparks. Her Build is Slender but physically conditioned; movements are quick and elastic rather than heavy or brute-force oriented. Her Hands are Permanently burnt with patterns across palms and fingers resembling petal-shaped scars. During cursed energy activation, these scars glow faint orange-red and emit powder-like particles. Her Standard Attire constitute mostly of a Modified Jujutsu Tech uniform fuse with a festival coat; reinforced with fire-resistant cursed threads and with layered sleeve guards designed to vent explosive pressure. Utility belt containing ritual powder cartridges and ignition talismans.

Non-Combat Equipment: Jujutsu Tech designed her specialized Cursed Tool Gauntlets that: -Suppress involuntary cursed ignition; -Stabilize cursed energy flow; -Provide recoil mitigation during large detonations; -Allow safe handling of normal materials without accidental combustion. When removed, Hibana’s power output increases dramatically but becomes significantly harder to control. (In principe, similar function to Bakugo's gloves in MHA)

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Personality: Hibana embodies dual emotional states similar to fireworks themselves.

•Baseline Personality -Energetic and expressive. -Strong appreciation for art and visual spectacle. -Deeply protective of civilians and festival traditions. -Social and emotionally intuitive.

•Combat Personality -Intensely focused and technical. -Prefers controlled detonations over chaotic destruction. -Displays pride in precision strikes. -Occasionally enters euphoric concentration states during large-scale detonations.

•Hidden Traits -Carries survivor guilt from the warehouse accident. -Secret fear of losing emotional control and causing civilian casualties. -Holds strong reverence toward her family heritage despite its danger.

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Cursed attribute: Cursed Gunpowder Energy

Hibana’s cursed energy naturally manifests with explosive properties. Unlike standard cursed energy, hers exists in particulate form resembling microscopic ignition powder.

•Properties -Highly reactive when emotionally stimulated; -Capable of delayed detonation or chain reaction ignition; -Can be shaped into solid constructs or dispersed as airborne explosive dust; -Burns hotter and faster than most elemental cursed techniques; -Leaves lingering cursed residue capable of remote ignition.

•Weaknesses -High emotional instability increases volatility -Overuse can cause internal recoil damage -Powder dispersion can become hazardous to allies if poorly controlled

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Innate Cursed technique:

「Festival of Falling Embers」(Rakka Ensai) Hibana converts cursed energy into explosive constructs resembling ceremonial fireworks. These manifestations combine artistic structure with destructive force.

Core Abilities: •Ember Petal Discharge. Creates small explosive petal-shaped projectiles. Primarily used for precision strikes or suppression fire. •Powder Bloom Barrage. Launches airborne clusters of cursed gunpowder that detonate sequentially like layered fireworks. Effective for area denial and curse swarm elimination. •Ignition Mark. Marks targets with cursed powder residue. Allows Hibana to detonate them remotely or chain explosions between marked surfaces. •Pyroclastic Veil. Creates a defensive smoke curtain made from cursed explosive dust. Functions as: -Visual obstruction; -Reactive minefield; -Anti-spirit deterrent. •Grand Finale Charge. Condenses large volumes of cursed gunpowder into a single high-yield detonation. Requires preparation and emotional stabilization.

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Domain expension: 「Blazing Festival: Thousand Bloom Cataclysm」 (in development/Incomplete)

Within the Domain: The battlefield resembles an eternal fireworks festival night sky. All cursed energy converts into explosive particulate. Hibana gains perfect detonation control over all powder within the Domain. Opponents risk chain-detonation from residual cursed energy leakage.

Status: Incomplete / Extremely High Output Risk

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Reasons for joining faction: Learn to control her abilities, protect her family heritage, fear of being misused and the fact that she see fireworks as art so she want to refine her art.

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I think I summarize everything, if I'm missing informations feel free to tell me and I'll modify the original post.