To write Kaito's character development, consider how his relationship with Aoko changes his view of the world. He may become more empathetic towards the victims of the crimes he used to commit. Aoko, on the other hand, could develop by learning to trust Kaito more. She might start to let go of some of her rigid detective ways and be more open - minded. This could be shown through her reactions to Kaito's secrets and his past actions. You can also include how they both grow as a couple, learning to communicate better and support each other.
For Kaito, you can show his development from a carefree phantom thief to a more responsible husband. Maybe he starts to think twice about his risky stunts because he doesn't want to put Aoko in danger. For Aoko, her development could be from being just a detective focused on catching Kaito Kid to a more understanding and loving wife. She might start to see the good in Kaito's actions, even if they were illegal before.
Chapter 35, "Stunning Beauty Shocks the Prosperous Age, Tops the Trending Searches!!!", is the clearest early answer because it turns Prosperous Age's situation into a concrete plot event.
Chapter 342, "Founding Ceremony, Childhood Sweethearts, Did the Star-picking Hall Catch Fire?", is the clearest early answer because it turns Zhaixing Palace's situation into a concrete plot event. The chapter gives readers a real answer by opening on Hong Gang's Green Wolf Hunting Team has long since upgraded to an... and ending on The three of them continued walking along the edge of the medicinal....
Chapter 400, "Arriving at Yan City", is the clearest early answer because it pushes Jiang Cheng into a new phase or setting. It opens with What Jiang Zhao Yuan didn't expect was that, once Jiang Lili and... and closes on If you feel like you can't hold on, come find me..
Chapter 348, "Zhu Ling in Dire Straits, Eight Camps Martial Contest, Betting Five Years—East Ridge Has Fallen!", is the clearest early answer because it turns Beining Mountain's situation into a concrete plot event. The chapter turns that into something concrete by moving from If you defend or attack the stage successfully, you can earn one... to This only made Zhu Tong angrier..
Chapter 140, "Did Jiang Li Finally Crash?", is the clearest early answer because it turns Uncle Zhao's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the evening, the setting sun was like blood, dyeing the entire...
Chapter 163, "She Actually Gave President Shang a Zero?!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. It opens with Su Yinwan entered a small room, guided by a staff member.
Chapter 249, "Maxing Out Wilderness Survival Skills!", is the clearest early answer because the violence around Jiang Li becomes final instead of hypothetical.
Chapter 269, "Hello everyone, let me introduce my dear niece to you all!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 333, "Silver Mine from the Heavens, Yu Yao and Yu Sheng, No Need to Use a Bull Knife to Kill a Chicken [10,000-Word Mega Chapter Continued]", is the clearest early answer because the violence around Cold Resistance Level becomes final instead of hypothetical. The chapter turns that into something concrete by moving from Everyone, thank you for waiting!" Xia Hong's voice came from the... to Meng Ying and the others were filled with excitement, having secured....
Chapter 70, "Irresistible Stunning Charm", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.