A few possibilities here. How about Galt from "The Gamesters of Triskelion"? He is master Thrall and keeps all Thralls on a regimented training schedule, with harsh penalties to those who don't make the grade.
Edith Keeler? She gives everyone the same, healthy meal. And indeed, a part of that meal is a didactic talk by her.
No . . . I just think your guesses are arrested.
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