Game has 3 different classes to choose from.
Espers use mental energy to cast modern magic. In addition, they can use various assisting skills to flank enemies or heal allies.
Striders are known for their agility, which can be massively increased by skills. As a result, they can dominate enemies with their fast attack speed.
Guardians are known for their physical strength, thus melee abilities. Choose them if you want to be the team leader, tanker.