The censor
The Senate gave advice on government activities to the executive branch of the Roman government.
No branch of the Roman government represented the plebeians. The plebeian tribunes represented the plebeians. However, they were not a branch of the government. The did not have executive powers. The plebeians had had their own assembly, the Plebeian council.
Senate
the senate
consuls
consul
Senate.
Senate :D
No, the Roman republic did not have three branches of government. They only had two, hence the motto SPQR---the Senate and the Roman People. The Senate could roughly be defined as the upper branch and the popular assemblies could roughly be defined as the representative branch. The Praetors, who, among other things, corresponded to our judges or judicial branch of government, were a part of the Senatorial branch of government.
Senate :]
consul
First there are The Magistrates: They represented the tradition of monarchy.Secondly, There are the Senate: It represented the tradition of oligarchy.Lastly, the Assemblies represented the democratic element of the Roman Republic.