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.
Look to Chapter 157 for the clearest answer. It begins with It was already the last day of Flash Change in his dream., keeps building through His good score had successfully surpassed Jiang Li, making him first in..., and lands on I'm laughing myself crazy, do actors all have such strong.
Chapter 139 is the strongest chapter-level answer because it starts from Wen Jiaojiao's live stream was inundated with a wave of question marks. and follows through on The audience in the live stream didn't know about Wen Jiaojiao's inner....
If you want the clearest chapter reference, go to Chapter 117. Early on, Fragrant and cloyingly sweet potatoes and corn were out of the pot, and Qi...; later, the chapter leans on The searing heat made him grimace in pain, but he didn't let go, and he....
Look to Chapter 147 for the clearest answer. It begins with Xiao Xueyi nodded in agreement after listening., keeps building through Su Yinwan seemed to have matured overnight, becoming more and more adept..., and lands on Only Jiang Li glanced back at Director Sun, and then took out her own....
A practical answer is Chapter 182, because it turns the idea into a concrete scene. The chapter opens with At this moment, Qi Tianyu, who had just arrived in the Capital, couldn't..., adds pressure through So, when it came time to draw lots, she effortlessly drew a ball of the..., and ends on But.
Chapter 150 is the strongest chapter-level answer because it starts from Upon hearing the first part of Jiang Li's words, Zhang Cheng dismissed... and follows through on He spent the last few days visiting various renowned doctors, while also....
Look to Chapter 193 for the clearest answer. It begins with Jiang Shixu's eyes lit up when he heard there was a gift., keeps building through But the next second, he carefully asked, "Is this gift for everyone?" "No,..., and lands on Jiang Cheng was a prime example..
If you want the clearest chapter reference, go to Chapter 172. Early on, Not only Shu Yan, but the entire internet was shocked when they saw Su...; later, the chapter leans on Damn, what brand of make-up is Su Yinwan using?.
Look to Chapter 151 for the clearest answer. It begins with Now it was Zhang Cheng's turn to be confused., keeps building through The problem lies with He Yun?, and lands on I will have my assistant pay the bill.. That makes it a reliable bookmark because the chapter closes with Was he...
A practical answer is Chapter 120, because it turns the idea into a concrete scene. The chapter opens with Facing the sudden and somewhat strange request from Jiang Li, Director Sun..., adds pressure through Netizen: Wen Jiaojiao had been acting for years without much fame, but now..., and ends on.