The Three Great Bodhisattvas
The three great bodhisattvas are: Avalokiteshvara (Chenrezig, Guanyin) who represents the compassion of Buddha, Manjushri who represents the wisdom of Buddha, and 
Vajrapani represents the power of Buddha. 
 
Vajrapani is the indestructible power of the Buddha,  helping us overcome the delusions, poisons and attachments that prevent our progress.
 
Avalokiteshvara is the compassion of the Buddha,  helping us overcome ego and clinging, understanding our oneness with all beings.
 
Manjushri is the wisdom of the Buddha, helping us discern truth, and overcome the illusions that keep us trapped.
 
All three are equals. All are needed on the path to enlightenment. When compassion, wisdom and the power (i.e. discipline, etc.) are balanced the mental afflictions or negative emotions can be  overcome.
 
Vajrapani mantra in Sanskrit: Om Vajrapani Hum 
 
Avalokiteshvara mantra in Sanskrit: Om Mani Padme Hum
 
Manjushri mantra in Sanskrit: Oṃ A Ra Pa Tza Na Dhīḥ