Well, in the Green Lantern graphic novel, Agent Orange is a unique concept. It could be a form of energy or a substance that has a major impact on the Green Lantern Corps. It might be something that challenges the Lanterns' power and their mission to keep order in the universe. For example, it could be a corrupting force that turns good beings into something more malevolent, or it could be a power source that different factions are fighting over.
One interesting 'Harry Orange Lantern Fanfic' story could be about Harry finding an Orange Lantern power ring in the wizarding world. Maybe he has to learn how to use its power while also dealing with the magic he already knows. For example, he might use the Orange Lantern's power of avarice in a positive way to protect his friends and Hogwarts from dark wizards who are after the ring.
One interesting Naruto Orange Lantern fanfiction could be about Naruto obtaining an Orange Lantern ring and how it changes his powers. For example, the Orange Lantern power might enhance his Rasengan with the emotional energy of avarice in a unique way.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, and there's a good chance you'll find some great 'Harry Orange Lantern Fanfic' there. Just use the search function and type in the relevant keywords.
Perhaps a character from the Orange Lantern Corps gets lost in the world of Harry Potter. This character, with their Orange Lantern abilities, causes chaos as they try to find their way back. The Hogwarts professors might be intrigued by this new form of magic and power, while the students are both scared and fascinated. Harry and his friends would have to figure out how to deal with this stranger and their strange powers.
First, think about their backstory. Maybe they were once poor and now that they have the power of the Orange Lantern, they go to extremes to amass wealth. Then, give them a distinct personality. They could be sly and manipulative. Also, consider their appearance. They might have orange - tinted skin or wear ostentatious jewelry to show their newfound wealth.
The magic in Harry Potter is more about spells and potions, while Orange Lantern power is based on the emotional spectrum. In a fanfiction, they could combine by having a spell that unlocks the potential of the Orange Lantern ring within a wizard. For example, a powerful 'Revelio' - like spell could reveal the hidden power of the ring that a wizard has found.
In Naruto Orange Lantern fanfiction, Naruto's character may develop a more complex understanding of power. With the Orange Lantern ring, he has to deal with the emotions associated with avarice. This could make him more cautious about using his power, as he realizes it can be influenced by this new aspect of the Orange Lantern energy.
One interesting Orange Lantern OC fanfiction could be about an OC who struggles with the corrupting influence of the Orange Light. For example, the character might start as a regular person but gets drawn into the power of avarice. They then have to fight against their own inner greed while also dealing with other Lantern Corps who see them as a threat.