Ple-Sen
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Generally, with Anselm, your main goal is to survive the first phase, and then his mass paralysis will come in handy. Alessia is more challenging – preparing for AoE attacks takes a lot of time. However, if you know the enemy's base, you can try to preemptively cover it. As for Kal, with Discipline, she will be roughly as effective as Ren or Rohei, meaning she's suitable for a blitzkrieg, but besides mediocre fighting skills, she won't offer much else. Except perhaps protecting teammates from other melee units.