ACE

ACE are Artificial Devil Fruit (人造悪魔の実, Jinzō Akuma no Mi), specifically, those of the Logia-type. The formula of the same name was created and perfected by Drakengar D. Shiva, during her time as Kiesler Love's partner, and is currently the only known manufacturer of successful Artificial Logia-type Devil Fruits.

Trivia

 * According to Shiva, she named the formula and fruits "ACE" due to believing they would be her "ace in the hole" in her goals, as well as a direct reference to Portgas D. Ace.
 * Love's reasoning is derived from the JOKER being her "wildcard", something that could be unpredictable and have any number of potential results, as well as a direct reference to Donquixote Doflamingo, who dealt with Artificial Devil Fruits in the Black Market in the past, under the alias of "Joker".