I'm making a retro-minimalist style RPG and I was wondering what people's thoughts are on icons. Should I make Icons that are individual for each class that never change or have overlays?

From what I can tell, blanket icons allow for everyone to know exactly what class they're versing but cut down on customization. Overlays mean each class is obfuscated but it allows players to make their character look exactly how they want.

Thoughts,ideas? Cheers