It depends whether or not there is a reason that the minions in this particular encounter should look any different from the normals.I am not sure how to describe them to the players, or even if they should be described differently than the other opponents. After reading another thread about having 25 minions and a few regular monsters in an encounter area, I began thinking about how I would describe them differently, and then wondering even if I should.
And like in real life the officer is not necessarily a better combatant than the lower ranked soldierEven in real life, soldiers and officers are clearly different one can ascertain the difference.
Last but not least: Fell free to switch as you see fit and make cultured opponents whith the best armed guy truly being the non-minion and make brutish hordes with minions indistinguishable from the elites. Just look at these orcs and try if you can tell who is the minion.
Minions do present a real threat. They're non-trivial to hit, and they deal enough damage that you can't just ignore them....but if they KNOW that these things have only one hit point, doesn't that kinda defeat the "good feeling of accomplishment?"

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.