I view the Che character in Evita as an “everyman” who just happens to have a passing resemblance to Guevera. The actor in the show we saw played it that way; he mugged, he changed accents, he could be in various costumes. It’s like the authors had the character written into the show, then decided, Hey, wouldn’t it be cool to name him “Che”? Well, maybe, not so much. <shrug>