Milly

Underwater Twin is a minor character in Candy Crush Saga. She is Tiffi's twin sister even tough she is a mermaid. She is encountered in the twenty-second episode, Savoury Shores. Tiffi refers to her as "underwater twin" when she arrives, and it's revealed that she has lost her seahorses. After completing level 320, Tiffi plays an instrument that attracts the seahorses. Underwater Twin is ecstatic at their return and thanks Tiffi.

Trivia

 * It is unknown if they are actually twin sisters, or if Tiffi was just making a comment based on how similar they looked.
 * She is sometimes erroneously called Juli.