I put the official character colors in a website that gave names for each hex code and Ibuki's was just "sea" and I found it funny. My other favorites are:

Surf (Wataru) Thunder (Tetora) Ukraine Yellow (Shinobu) Spanish Red (Chiaki) Rio Grande (Hiyori) Chinese Pink (Hinata) German Blue (Yuta) Liberty (Souma) Lochinvar (Raika)