Granolah holds a deep love for his people and is constantly haunted in his dreams by the memory of the Frieza Force arriving and the Saiyans transforming into Great Apes while destroying his city, leading to an obsession with avenging his fall brethren and a seething hatred for Frieza and the invading Saiyans who eradicated his fellow Cerealians. Part of the reason Granolah and Monaito reside in a mountaintop home is because it gives him a clear view of his hometown’s remains and serves as a constant reminder to himself of what the Saiyans and the Frieza Force did to his planet.
In an ironic twist, Granolah is similar to Frieza in that he underestimates his opponents, as seen when he expressed shocked by Vegeta’s growing potential. He also did not try to master control of his powers by training, leaving him unprepared for the strength of Vegeta’s Ultra Ego form.