For the story in Trials of Mana, you could go for a party like Angeldust, Lise, and Gato. Angeldust is super powerful when it comes to magic attacks, which are very important for dealing with the tougher enemies in the story. Lise is there to heal and buff the party, ensuring everyone stays in good shape. Gato is really fast and can get in and out of battles quickly, using his skills to disrupt the enemy. Their combined abilities make it easier to move forward in the story.
A party with a tank, a healer, and a damage dealer is often ideal. For instance, if you choose Duran as the tank, he can soak up damage. Pair him with Angela as the healer to keep everyone alive. And then add Hawkeye as the damage dealer, especially with his ranged attacks. This setup can help you get through most of the story scenarios without much trouble.