They could both be developed through their relationship with other Gorillaz characters. For example, they get into an argument with Murdoc over the direction of a new album. This conflict forces them to re - evaluate their own positions and grow as characters. They might also learn from each other's ways of handling the conflict, with 2D being more passive and Ace being more assertive.
For 2D, you could explore his insecurities more deeply. Maybe he's insecure about his voice compared to Ace's. So, he starts taking vocal lessons from Ace in the fanfiction. This would not only develop his character but also show his determination to grow as an artist.
Ace could be developed by showing his backstory. How did he become the person he is? Maybe he had a rough childhood and music was his escape. When he meets 2D, he sees a bit of his younger self in 2D and wants to protect him and help him succeed in the music world. This would add more layers to Ace's character.
To develop 2D further, focus on his growth as an artist. Show him struggling with writer's block and then finding new inspiration in unexpected places. This could be through meeting a new type of person or experiencing a different culture. For Noodle, you could develop her character by exploring her family background. Maybe she discovers she has a long - lost relative who is also a great musician or artist, and this new connection changes her perspective on her own identity within the Gorillaz.
One idea could be that 2D and Ace go on a musical journey together. They explore different sounds and create a new genre of music that combines their unique styles. Maybe they start in the streets of a big city, busking and gathering a following.
For Sawamura, his character could be developed by exploring his insecurities more deeply. In fanfiction, he could have moments where he doubts his abilities as a pitcher, not just in terms of his skills but also his mental strength. Miyuki could then be the one to help him through those tough times, which would strengthen their bond.
For Gay Sabastion, you could explore his backstory more. Maybe he had a difficult childhood that made him the person he is today. This could add depth to his character and his relationship with Ciel.
For Mallow, her character could be developed further by exploring her family background more deeply. Maybe there are secrets in her family related to a certain type of Pokemon. In the context of Pokemon Sun, the main character could help her uncover these secrets, which would make her more confident and also add more depth to her character.
To develop Miketsukami's character further, we could explore his past more deeply. Maybe there are some hidden traumas or experiences that have shaped his loyalty towards Ririchiyo. For Ririchiyo, we can show her growing into a more confident leader, using her relationship with Miketsukami as a source of strength.
With Reborn, you can develop his past. Maybe write a story where we learn more about his training and how he became the world - class hitman. This could add more depth to his character and also show how his past experiences influence his relationship with Tsuna. For example, if he had a difficult master - apprentice relationship in the past, it could make his bond with Tsuna even more special.
For Knuckles, you could explore his relationship with his tribe more deeply. Maybe in the fanfiction, he discovers some ancient scrolls left by his ancestors that give him new powers or knowledge. This could change his interactions with Rouge and Sonic. As for Rouge, you could develop her character by showing more of her backstory, like how she became interested in jewels and espionage in the first place.
To write a good Gorillaz 2D x Reader fanfiction, first, study the character of 2D. Know his traits like his love for music, his somewhat naive nature, and his distinct appearance. Then, create a believable scenario for the reader to interact with him. It could be at a concert or in a recording studio. Make the dialogue between the reader and 2D natural, as if they could really be having that conversation. Also, add some details from the Gorillaz universe, like references to their albums or other band members.
You could also develop their characters through their interactions with other characters. Zero's relationships with other vampire hunters or his classmates could influence how he behaves with Kaname. And Kaname's interactions with other Purebloods could affect how he approaches Zero. For example, if Kaname has to deal with a Pureblood who is jealous of his relationship with Zero, it could bring out new aspects of his character.