I always talk about how at least Dewey, Yellow Tail and Peedee are gem experiments, right? I believe they were created in that order - but I think Rose had different personal goals in mind when creating each of them:
Bill Dewey was created when Buddy Budwick and Beach City founder William Dewey were alive, or at least around in some way, possibly as revived life forms, like Lars and Lion. Bill, or BILLIAM!!1 is a sort of fusion made with cuts of serpentine varieties imprinted onto William (Williamsite) and Buddy (Lizardite?), creating Deweylite.
Rose may have used cuts of serpentine because the only way she could feasibly cure corruption without the other Diamonds was to use humans to stabilize cuts of a corrupted gem - make some hybrids?
Yellow Tail was created as a direct response to Rose interacting with baby Sour Cream - Rose's personal here is unknown to be, tbh. I think she learned that Marty had ditched Vidalia and wanted to give Sour Cream a dad - to the point where I think Rose originally wanted to call Yellow Tail ‘Yellow Dad’ but she changed it for some reason. Yellow Tail could also be the ‘tail’ of the snake in the serpentine cuts and maybe that’s an indirect namesake?
Peedee was probably created shortly before Steven was born. Rose might have been trying to figure out how to make an actual child as opposed to adults - and Peedee’s creation might have been directly tied to Steven’s aging process. Essentially Rose had never created a child before. (Hot 2 Tot?) Peedee was a final prototype before Steven.
Other than Yellow Tail, I don’t know how this relates to Rose and other people. Was she trying to appease ‘one of the men who came into her life now and again’ by giving William and/or Buddy some sort of superhuman son and... made Billiam by mistake? Did Mr. Fryman feel he needed a second son to keep Ronaldo sane?
There are differences between Dewey, Yellow Tail and Peedee that hints at them not being the same type of gems - Dewey’s pink and sweaty, Yellow Tail can’t talk, and Peedee is a middle-aged workaholic but the same apparent age as Steven. Was it just being part human that made them different, or were the cuts of Serpentine treated somehow to give their recipients different traits?
While I can find a gem name match for Dewey, I can’t find one for Yellow Tail or Peedee that would that would fit as neatly. That being said, the serpentine subgroup of minerals has LOADS of varieties. If you know of a gem name that would work for Peedee or Yellow Tail, please let me know!
adsfasdf honestly part of me is wondering if this might be the movie plot which would be hilarious because no one believes any of these theories. I think the gem in the promo shot is serpentine fff