VIDEOS:
Sandy & Blizzy
Sandy is red, being a fire user whose mannerisms come off as more aggressive, Blizzy is blue, being a ice user who is much more calm in his mannerisms, such as meditating to control his projectiles.
Example of:
Red Oni, Blue Oni
The Miser Brothers
Example of:
Fire/Ice Duo
Sauron vs. Lich King
Example of:
Fire/Ice Duo
Bloom and Icy
Example of:
Fire/Ice Duo
Fire and Ice King Skeletons
Example of:
Fire/Ice Duo
Pyro vs. Mei
Example of:
Fire/Ice Duo
Blizzard and Volcanic Lords
Example of:
Fire/Ice Duo