Looks like a stink bug. Some will harm your plants like the Nezara viridula (southern green stink bug) or Halyomorpha halys, etc.
I would not want stink bugs on plants, maybe someone can identify the exact stink bug species that one is.
Name: Virginia Charleston, SC (Zone 8b) Köppen climate classification Cfa
Looks like a shield bug, maybe a bordered plant bug of some sort (Largus sp.). It might help to know where in the world that bug lives to get a better ID.