It's recommended to raise Earth/Moon attribute characters early in the game.

Yakumo Yukari << Chapter 1 boss and a "newbie shredder". Her weakness is Earth/Moon attribute. Yukari randomly gains one of the following 3 buffs at the start of her turn each round: - Speed/Evasion Up - Both Attack/Defense Up - Accuracy Up/Barrier +1 If you're going to break her barrier, it's best to finish it in one turn. As mentioned before, she has barrier recovery abilities. Another strategy is to bring Reimu (L1) and a healing-type character. Reimu's 0-boost spread shot is a "guaranteed hit shot (必中彈)", meaning it always hits regardless of the opponent's evasion stat, so you can stall Yukari to death. ...If you can survive until then. (Reimu isn't the only one who can fire a guaranteed hit shot with a 0-boost normal attack. However, Reimu is relatively easy to obtain..?) If you complete the quests, you'll likely get a free character named "Rasen Udongein Inaba", who is Moon attribute, so you can raise her.