In this scene, Brutus asks Voluminous to come closer to him, to tell him that he has seen Caesar's ghost two times at night, one at Sardis and the other at Philipi fields. He interprets it as a message, and realizes that his time has come, since enemies have almost won. Eventually, he decides it is better to die by his own means that to let his enemies kill him.
Answer: He is described as shy and out looking. He is described as the type of character to go looking for things but is easily influenced. This reveals that he is open to suggestions and he can be controlled easily