I believe Brutus is a tragic hero. He does not desire to murder Caesar because he loves Caesar. However, Brutus goes against his own feelings for the good of Rome.
Brutus is a hero, a tragic one. He takes the life of Caesar because he loves Rome more than he loves Caesar. Brutus is intent on keeping Rome free from tyranny. He risks his life to keep Rome free from slavery. Brutus admits that he would rather be a common villager than to become a slave under Caesar's leadership:
Brutus would rather be a villager
Than to say he is a son of Rome Under the hard conditions that these times
Are likely to lay on us.
Brutus is no doubt a hero. He follows through with the conspiracy because he fears that Caesar has become too ambitious:
What does this shouting mean? I’m afraid the people
Are going to choose Caesar for their king.
Brutus gives his reasons for agreeing to the conspiracy against Caesar:
He must die, and, for my part,
I don’t know a personal cause to throw at him,
But for the general complaints. He wants to be crowned.
There's the question: how that might change his nature.
A bright day brings out the black, poison snake,
And that means we must walk carefully. Crown him?— that.
And then, I admit, he may do danger, at his will, with
A sting that we put in him.
The abuse of greatness is when it disconnects
Remorse from power, and, to speak truth about Caesar,
I haven’t known a time when his emotions were swayed
More than his reason. But it’s common knowledge
That being lowly is young ambition's ladder
Where the one who would climb upward looks for help,
But, when he once he gets to the top,
He then turns his back to the ladder and
Looks to the clouds, scorning the common ladder
By which he ascended. Caesar might do the same thing.
Then, because he might, we must prevent it. And, since the quarrelis rather thin for the thing he is,
We must make it sound like this—that what he is,
With some additions, would run to these and these extremities.
And for that reason we must think of him as a serpent's egg
Which hatched, would, as his kind grow dangerous,
And kill him in the shell.
With these comments, Brutus is no doubt a hero. He realizes that Caesar has become overly ambitious. Now, something must be done about Caesar's ambition. Brutus is man enough to agree to the conspiracy that is forming. Brutus proves himself a brave leader in his agreement to rid Rome of Caesar's ambition.
Even in the end, Brutus proves himself brave when he falls on his own sword. He would rather die that live under the oppression of a tyrannical government.
Marc Antony admits that Brutus was more noble than all the conspirators. Antony admits that Brutus did what he did for the common good of all. Antony's kind words about Brutus prove that Brutus was indeed a hero:
This was the noblest Roman of them all.
All the conspirators, except him,
Did that they did out of jealousy of great Caesar;
Only he, in a general-honest thought
And common good to all, made one of them.
His life was gentle, and the elements
So mixed in him that Nature might stand up
And say to all the world, "This was a man!"