Frieza (Furīza, Freeza) is one of the worst villains in the Dragon Ball manga and anime. He is a galactic ruler of an unknown race who directs the trade of planets around the galaxy, and his feared for his ruthlessness and power. He is the son of King Cold and Cooler's younger brother. Freezer is also making appearances in several movies, Dragon Ball Z and Dragon Ball GT. His name is a rewrite of "freezer", while his brother's name refers to a cooler.
Cell (Seru) is a great villain and the ultimate creation of Dr. Gero, designed to have all the capabilities of the greatest fighters that ever lived or visited Earth. The result is a "perfect warrior" with many traits and special abilities. It should be noted that Cell is the only creature belonging to the red ribbon army who does not have the badge of red ribbon on at one time or another. It is also interesting to note that he is one of the few creatures not directly created by Dr. Gero, the others are Android 13, and maybe Android 8. Both Cell's and Android 13's designs were completed by Dr. Gero's Super Computer.