大勢至菩薩, is known or described in the Mahayana. Mahasthamaprapta is in Sanskrit language.
Vajrapani , Vajrasattva, Vajradhara these are the three descriptions in the Vajrayana school, each name and manifestation is in unique different form and purposes according to the teachings.
Vajrapani 金刚手菩萨
Vajrasattva 金刚菩萨
Vajradhara 金刚勇猛心菩萨
Vajrapani is the Buddha of skillful means and he is signifies as a Vajra as solid as diamonds and unbreakable, with this aspect it signifies the ability to conquer any circumstances, discouraging, doubtful, gloomy, inauspicious, infelicitous, ominous, unfavourable, and it will transform all into a path of spiritual fulfillments and to bring great meritorious and benefits to all sentient beings. Vajrapani Bodhisattva because of his conquers to all the harmful, evils negatively forces without mercy and he often symbolized or depicted in a very wrathful , demonic, evil form and many people who know nothing or very little knowledge of Vajrapani in Vajrayana Buddhism, he can be a very terrifying, fearsome beast and easily misunderstood or misleading by his images and may become a controversial issue with the Buddha teachings.
Vajrapani is traditionally pictured in a dancing posture and within a halo of flames of wisdom fire, which represent transformation.He is holding a vajra or thunderbolt in his right hand, which emphasizes the power to cut through the darkness of delusion. Vajrapani looks wrathful, but as a representation of the enlightened mind, he’s completely free from hatred.He represents the ability to enter into any situation, no matter how unpromising, and transforms it into a path of spiritual fulfillment and benefit for all. Because he conquers the forces of harm and negativity without mercy.