Toriyama's first designs were based heavily on the Chinese legend "Journey to the West." The monkey-like character heavily resembles his Chinese counterpart, as does Oolong's early incarnation.
As Toriyama mentions on one of his comics, he nearly gave Goku a sailor boy look as pictured here. I can only imagine the Sailor Moon jokes Dragonball fans would be hearing today if Toriyama hadn't found the design uninteresting.
It's Neanderthal Goku?!?! Quite an imposing figure indeed. I am glad that Akira lengthened the SSj3 hair in its final incarnation, which makes for a more dramatic transformation.
Held in the hearts of some of Dragonball's female fans as the sexiest character, Teenage Gohan could have become the ultimate chick repellent! Just one look at Boy Scout Gohan would send most girls running to the loving embrace of Trunks.
From the looks of these concept sketches, the infamous Cell could have ended up with a very human appearance on one extreme or a very demon-like appearance on the other. Some sketches even resemble characters such as Guldo, Kooler, Frieza, and even Namek look-alikes.
Not much of a difference from the actual one but if you look at the bottom right you'll notice it. We could have ended up with a bald Mr.Satan.
There isn't too much variation here either. As you can see, Kaio-sama could have ended up looking like a Japanese sumo wrestler or in a more American "Chinese-stereotype" form.
Mr. Popo could have come out looking world's different than he did. For instance, we could be watching a fish-like creature running through the bowels of heaven with Kami, or we could have seen a weathered old man chasing Goten and Trunks around heaven.