Eva is one of the protagonist's main rivals, along with Damien. Like the player, she is on a Pokémon adventure of her own. She appears across the region, either challenging the player to battles or teaming up with them in times of crisis. Eva is part of the friendship system, meaning that the ways in which the player decides to interact with her (and with Damien) will affect her role in the story.
Eva, like Damien, is fairly energetic. She is enthusiastic about Pokémon and learning battle techniques. She is in the top of her class in her hometown. Eva is more methodological than Damien, preferring to work in a controlled and logical environment. She wishes to shake this habit, however, and believes that immersing herself within a Pokémon Journey is the best way to experience and uncontrollable environment. She strives to understand Vereshad's culture and finds the range of Pokémon in the region fascinating. An outsider to the region, Eva sometimes struggles to feel a sense of belonging within the community. If the player is closer friends with Damien than with her, this exacerbates the problem. Eva will become more prickly and difficult to befriend, no matter how nice the player is to her.
Eva is an exchange student from the Dorobo region. She came to Vereshad to study its culture and diverse range of Pokémon. The protagonist will learn more about her personality, goals, and personal struggles with a high friendship. Eva originally met Professor Sakura when she was traveling by Eva's hometown, and Professor Sakura invited Eva to Cadere Town when she was ready to start her Pokémon adventure.
Eva is part of the friendship system, so her relationship with the protagonist is influenced by the player's in-game dialogue choices.
Eva meets the protagonist at the beginning of the game in Cadere Town. She views the protagonist as a strong trainer and is determined to study their training style for her own benefit. Eva's friendship with the protagonist can develop more depending on the player's choices.
Eva met Damien when she first arrived in Cadere Town to meet with Professor Sakura. She sees Damien as her first friend in Vereshad apart from Professor Sakura. She does not know how to handle Damien's baseless optimism, but she does appreciate it during their encounters. Eva finds Damien's desire to be "cool" absurd. She constantly tries to "correct" his training style to be "better" because she cares about him and wants to see him go far on his Pokémon journey. She is annoyed when Damien comments or plays on her misunderstanding of the Vereshad region. Eva feels genuinely hurt when he critiques. Her relationship with Damien can change in the game depending on the protagonist's choices.
Eva met Professor Sakura when she was a child, before Professor Sakura became the Professor of Cadere Town. Eva was impressed with her range of knowledge, which inspired her to pursue Pokémon. Professor Sakura is the reason Eva came to Vereshad since her hometown did not have their own Professor to start trainers on their journey. Eva sees Professor Sakura as a role model, even though her excited antics can frustrate Eva.
Eva does not know much about Mariana besides the fact that Mariana is the region's Pokémon Champion. She likes Mariana's training style and outlook on Pokémon. Eva loses her battle against Mariana and appears distressed, but Mariana insists that she is a strong trainer and tries to lift Eva's spirits.
Eva does not know much about Martin besides the fact that Martin is the region's Fairy-Type Gym Leader. She is frustrated that it took two attempts to defeat Martin at his gym, but she respects him as a talented trainer. She does not notice that Martin treats her more harsh compared to other characters.