You can start by observing real children. Notice their behaviors, reactions, and the way they interact with others. Use those observations in your story.
To write a child's personality well, you could think about their fears and dreams. For example, a child who is afraid of the dark might show bravery when faced with it. Or a child who dreams of being a superhero might act out those fantasies in play. Incorporate these elements to make the personality come alive.
You need to focus on their innocence and curiosity. Make their actions and thoughts simple yet charming.
In historical fiction, Mary Tudor is often depicted as a very devout Catholic. For example, she is shown as being determined to bring back Catholicism to England.
Some writers will describe the child's appearance based on their abilities. Since Naruto has a strong physical build due to his ninja training, the child might have a somewhat athletic build as well. If they inherit Shion's spiritual powers, they could have an otherworldly glow about them. Their hair could be long like Shion's or short like Naruto's, depending on the writer's vision. Maybe the child has a tattoo or marking on their body that is related to Shion's spiritual lineage, but in a more subdued form so it doesn't overpower their overall ninja - like appearance.
In certain fanfictions, Viserys could be shown as a tragic figure. His pride and his sense of entitlement are still there, but his downfall is explored in more depth. He might be portrayed as a man who was in over his head, trying to play a game of thrones that he didn't fully understand, and his personality flaws are what ultimately led to his demise.
Mindhunter likely depicted the Atlanta Child Murders by showing the chaos and fear in the city during that time. It might have shown the investigators' struggle to find the killer, like their interviews with witnesses and the difficulties in collecting evidence.
The movie 'Beasts of No Nation' vividly depicts the real story of child soldiers by showing their psychological transformation. At first, the main character is a scared and innocent child. But as he is forced into the life of a soldier, he becomes desensitized to violence. We see how the environment of the armed group changes him, making him do things that are against his nature as a child. Also, it shows the power dynamics within the group, where the commanders have total control over these young lives.
Since Ino is quite intelligent and perceptive, the child could inherit that. They would be very good at reading people's emotions and motives. This would help them in both their personal relationships and in their ninja duties, like during negotiations or spying missions.
In fanfiction, Sasuke is often depicted as a strict yet loving father. He might be distant at times because of his past, but he always has his family's best interests at heart. For example, he could be strict about his child's ninja training to ensure they can protect themselves. Sakura, as the mother, is usually the more affectionate one, always there to comfort the child when they're sad or hurt.
The child would likely inherit Draco's sense of pride, but in a more positive way. Instead of being prideful about pure - blood status like Draco was in his youth, it could be pride in their family's unique combination of backgrounds. From Hermione, the child would probably get a thirst for knowledge and a strong sense of justice. So, the child might be someone who stands up for what's right, especially when it comes to issues of equality in the wizarding world.
Given Batman's often solitary nature and Wonder Woman's more community - oriented nature, their child could have an internal struggle. They might be introverted like Batman at times, preferring to work alone on a problem, but also feel the pull towards being more involved with others like Wonder Woman. This duality in their personality could lead to some interesting character development as they grow up, trying to find a balance between their two parental influences.