What are three characteristics that are individual to Brutus and Cassius from Julius Caesar?
I assume you are asking what three characteristics do Brutus and Cassius share. First, they are both arrogant. They both believe that they have the right to commit an assassination, whether out of patriotism or jealousy.
Second, they both value friendship highly. Cassius, although clearly wanting more power and although he is the driving force behind the assassination, defers to Brutus in many instances. He agrees not to kill Antony, for example, even though he is wary (rightfully so) of the threat Antony poses. However, Cassius values Brutus. When Brutus insults him, he says: "Cassius is aweary of the world: / Hated by one he loves." He would rather die than be hated by his friend. Brutus, likewise, values frienship. He is conflicted about killing Caesar, and must talk himself into it. His love for his country in the end outweighs his love for his friend: "Not that I lov'd Caesar less, but that I lov'd Rome more."
Finally, the two characters share a reckless, even suicidal, streak. Cassius pulls his own sword to demand his own death when Brutus insults him. Brutus attacks early at Phillipi, basically sacrificing his army because he can't find a way to succeed. When all hope is definitely lost, he takes his own life.