For you android phone users.  I have a iPhone, but my husband might just be surprized when he picks up his phone!
 

Developer's Description By Fancy Keyboard 2019

The delight Koi Fish Keyboard Theme is a custom keyboard, which is specially designed for summer fish lovers.
The placid water typewriter with slick cobblestone keypad, delight koi fish, lucid dew, blooming lotus and sakura will make your phone look cool and delight in the sweltering summertime.
 
Lively 3D Koi Fish Keyboard - Free download and software reviews - CNET Download