Ficus carica (the edible fig) makes great bonsai. The best part is the spectacular leaf reduction (about 100 fold).
The strength of the species: the powerful trunk, full of character; large nebari; the fruits are the icing on the cake; drought-tolerant; tolerates drastic pruning, both on roots and branches; develops thick trunk in a short time;
The weaknesses are: ramification is slow, you need to do a lot of drastic cut-backs on the branches, in order to create nice ramification; large leaves (but that will easily reduce in pot-culture); needs frost protection in temperate climate;
The positives vastly outweigh the negatives. They are one of my favorite subjects. It also needs to be noted that I live in So. California, so here figs grow like weeds.