M4s
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For the Academy, the following heroes stand out: Jalib, Nazir, and Ora.
Jalib is more suitable for playing against Warlocks. I would advise him to learn Light Magic, Summoning, Sorcery, and Defense (either Attack or Logistics, depending on what becomes available). Ora casts Light Mania well, so it is essential for her. Nazir is more suitable for playing on extremely difficult levels, as he can defeat large groups of level 1 and 2 troops at the beginning with almost no losses (ignoring the loss of turrets). The other heroes do not stand out as much compared to these three, in my opinion.