The role of a tulku in Tibetan Buddhism is a complex and multifaceted one. A tulku, also known as a reincarnate lama, is believed to be the rebirth of a highly realized master or teacher who has the ability to choose their own rebirth in order to continue their spiritual work. This concept is rooted in the belief in reincarnation and the idea that the mindstream of a highly realized being can continue on after death.

Tulkus are highly revered in Tibetan Buddhism and are seen as living embodiments of the Buddha's teachings. They are considered to be the spiritual heirs of their previous incarnation and are believed to possess the same wisdom, compassion, and spiritual power. As such, they are seen as authoritative and influential figures in the Tibetan Buddhist community.

One of the main roles of a tulku is to serve as a teacher and guide for their students. They are responsible for passing on the teachings and practices of their lineage to the next generation. Due to their supposed connection to their previous incarnation, tulkus are believed to have a deep understanding and realization of the teachings, making them highly qualified to transmit them to others.

Tulkus also play a significant role in upholding the traditions and rituals of their lineage. They are often the head of monasteries or centers and are responsible for maintaining the spiritual and cultural heritage of their community. They also perform important ceremonies and rituals, such as empowerments and initiations, which are believed to have a powerful effect on the spiritual development of their students.

Additionally, tulkus are seen as spiritual leaders and guides for their community. They are often sought out for advice and guidance on personal and spiritual matters. They also serve as role models for their students, demonstrating the qualities of a realized being through their actions and teachings.

In conclusion, the role of a tulku in Tibetan Buddhism is a crucial one. They serve as teachers, spiritual leaders, and guardians of tradition, carrying on the lineage of their previous incarnation and guiding their students on the path to enlightenment. Their presence is seen as a blessing and a source of inspiration for all those who come into contact with them.