As Dragon Ball progressed, Toriyama made the decison to add extraterrestrial elements into the series. They became an important part of the series from Volume.17 onwards. These volumes would be adapted into the anime Dragon Ball Z.
After the initial reveal that Son Goku was an alien, the series began to bring more and more people from the cosmos into it. By the end of the series, there were tons of fictional alien species. So my question for all of you is...
What's your favorite alien species that ever appeared in the Dragon Ball franchise? Feel free to explain, although it's not required. Have fun~