I have no idea who Wally Purling is in this story. However, if we assume it's a typical Christmas story, Wally Purling could be the protagonist. He could be an ordinary person who has an extraordinary Christmas adventure, or he could be a symbol of the Christmas spirit, spreading joy and kindness during the holiday season. But this is just speculation without knowing the actual story.
Wally and Kuki are likely characters in a particular fictional universe. They could be from a TV show, a video game, or a comic. Without more context, it's hard to say exactly who they are, but they are the focus of the fanfiction, which means fans are interested in exploring their relationship, be it friendship, romance, or some other kind of connection.
One potential storyline could be her struggle with identity. As an opposite - gender version of Wally, she might feel like she has to prove herself in a male - dominated superhero world. She could constantly be compared to the original Wally and have to find her own place. Another storyline could be a love triangle. For example, if there's a new male character on the team who is interested in her, but she has feelings for someone else, like Robin. This could create a lot of drama and tension within the team.
Often, the other members of the Young Justice team are involved. Artemis is frequently included. She might be the one trying to rescue Wally or be involved in the events that led to his being trapped. Robin also shows up a lot. He could be using his detective skills to figure out how to free Wally.
Wally could be developed by showing his growth in character. For example, if he was a bit cocky before, he could return more humble and with a deeper understanding of the world. This change could be a result of his experiences while he was away.
Writers can change her powers' manifestation. While male Wally's speed is often shown as a burst of energy, a female Wally could have a more graceful use of speed, like her movements are more like a dance. Her costume design could also be different. It might be more form - fitting or have more feminine elements, which could affect how she moves and fights. In terms of her role in the team, she could be the one who calms down arguments, using her charm and emotional intelligence, rather than being the joker that male Wally often is.
Well, I really like the fanfic 'Wally West: Racing Against Time'. It's a thrilling read as it pits Wally against a new and powerful enemy that can manipulate time, which creates a whole new set of challenges for him. Then there's 'Wally West and the Lost Speed Force'. This one is more of an emotional journey as Wally tries to find his connection to the speed force again. And don't forget 'Wally West's Allies and Adversaries' which gives great insights into the characters he interacts with.