Team Tobirama

Team Tobirama was a team led by the future Second Hokage, Tobirama Senju. It was comprised of himself, Hiruzen Sarutobi, Homura Mitokado, and Koharu Utatane. Very little is known of the team, but on occasion during the First Shinobi World War, they teamed up with Danzō Shimura, Kagami Uchiha, and Torifu Akimichi to carry out a mission. While being pursued by enemy Kumogakure ninja, Tobirama sacrificed his life to give the others a chance to escape. Before leaving, however, he appointed Hiruzen as the Third Hokage. Homura and Koharu would later form the Konoha Council and become advisers to Hiruzen and future Hokage.

Trivia

 * Hashirama Senju appears alongside his brother and his team in some flashbacks. This is because Hashirama trained Hiruzen as well, who was seemingly being groomed to become Hokage from a young age.
 * It was shown that at least at one point in time all three members of the team wore a similar jumpsuit outfit.

Reference
Team Nidaime