The South African Jade, or Portulacaria Afra is a tiny-leafed jade with a rough wood-colored trunk and branches, making it ideal for bonsai cultivation.  It will survive without any direct sun, or with all-day sun. If direct sun is available, a few hours a day will improve growth and overall appearance of this pre-bonsai.  Being a succulent, it can go for days without water.   Like the Schefflera Arboricola it is the perfect bonsai for an office, or for someone who has little or no sunlight available, or who is away from their home or office for days at a time.
In South Africa full sized specimens are known as "Elephant trees" because elephants like to "scratch" their thick skin on the rough bark.