The Kappa shares its name with the Japanese name for the Imp status. In the PlayStation version, Kappa was simply referred to as Imp during Gau's tutorial, but all other releases have called the character Kappa.
In the Gameboy Advance and later versions, the Kappa appears to congratulate the player for completing the Dragon's Den after they defeat Kaiser Dragon and receive the Diabolos magicite, and directs them to an island west of Mobliz where the party can enter the Soul Shrine.
The Kappa makes a small cameo as a tutor from the in-game manuals.
Admirers of these slimy green monsters have even create [sic] robots modeled in their image.
The Kappa, under the name Imp, is one of the of the Premium Character Shop random purchases, performing Whirlpool Strike as their attack.
Kappa are legendary creatures, a type of water sprite in Japanese folklore.
imp is "a small, mischievous devil or sprite".An
In the Japanese version of Final Fantasy VI, the Green Cherry is called the Yellow Cherry. Together with the Imp status, known as Kappa in the Japanese version, the two are a reference to the Kizakura sake brand, which prominently uses a kappa as its mascot and often features it in marketing alongside yellow cherry blossoms; kizakura means "yellow cherry".