Asanga, the founder of Yogachara Buddhism, played a significant role in the development of Mahayana Buddhism. His contributions helped shape the philosophical and doctrinal foundations of this branch of Buddhism.

One of the most significant roles that Asanga played was in the development and popularization of the concept of Bodhisattva. He emphasized the idea of a Bodhisattva as an enlightened being who postpones their own enlightenment to help others achieve it. This concept became a central tenet of Mahayana Buddhism and inspired many followers to strive towards becoming Bodhisattvas themselves.

Asanga also played a crucial role in the development of the Yogachara school of thought. This school focused on the idea of consciousness and the nature of reality. Asanga's teachings emphasized the importance of understanding the true nature of the mind and the role it plays in shaping our perceptions of the world. He also introduced the concept of the "storehouse consciousness," which is seen as the repository of all past experiences and influences our present actions and thoughts.

Furthermore, Asanga's works, particularly the Mahayanasamgraha, played a significant role in the spread of Mahayana Buddhism. This text, which is a compendium of Mahayana teachings, became a popular and influential text among Mahayana practitioners. Asanga's clear and systematic presentation of Mahayana doctrines helped to popularize and spread the teachings to different regions.

Moreover, Asanga's contributions to the development of Mahayana Buddhism also extended to the field of meditation. He emphasized the practice of meditation as a means to attain enlightenment and gain insight into the true nature of reality. Asanga's techniques and teachings on meditation were influential in shaping the practices of Mahayana practitioners.

In addition to his philosophical and doctrinal contributions, Asanga also played a significant role in the formation of the Mahayana monastic community. He established the first Mahayana monastery in India, which served as a center for the study and practice of Mahayana Buddhism. This monastery became a model for other Mahayana monasteries, and its influence spread throughout Asia.

In conclusion, Asanga's contributions to the development of Mahayana Buddhism were significant and far-reaching. His teachings on Bodhisattva ideals, consciousness, meditation, and establishment of a monastic community helped shape the foundations of Mahayana Buddhism. Asanga's influence continues to be felt in the practice and teachings of Mahayana Buddhism, making him a pivotal figure in its development.