As a Story of Bubble Bobble Series, those the two younger creatures, but they still are humans on a great different stories as they are twin brothers in japanese version for many adventures, is much like Hello Kitty Series from Sanrio of japanese anime, that looks like a same thing as them. So Bub and Bob was born lives in "Bubble World" with their parents, and they had grandparents too. Certainly Bub and Bob's had many friends and everyone's love to share many adventures!
Shawne Vinson