https://youtu.be/DK_dmKtufnM
Appearance
The artworks of "
Graydle Impact" and "
Graydle Parasite" suggest that the original monsters are liquid metallic alien slime creatures that arrived on Earth and parasitically possess other creatures. Furthermore, it seems that they can mold themselves, such as splitting in two as shown in "
Graydle Split" or merging together to form chimera-like monsters, such as the
Synchro Monster "
Graydle Dragon".
The color scheme of the possessed creatures is based in the three main types of cards: Monster ("
Graydle Eagle"), Trap ("
Graydle Cobra") and Spell ("
Graydle Alligator"). Furthermore, all of the Main Deck monsters' ATK and DEF sums 2000, so far.
https://youtu.be/i-7A3fE9k4U
"Rokket" is a play on the word "rocket". Its Japanese name, "Vullet", is a corruption of "bullet", playing on the tendency of Japanese to replace "V" sounds with "B" ones. It may also reference the archetype's user in the anime, Varis, who shares a similar gun and ammunition theme in his original Japanese name and the design of his mask. The "
Borrel" archetype uses the same play with the word "barrel".