Poor/slaves - Depending on who is their master, they may have almost no rights to large amounts of rights. If they have a 'horrible' master, they are usually worked to the bone and did not have any 'extras', for example being able to go view games, etc. If they have a 'good' master, they get treated well, and have the 'extras'.
consule- A consul is one of two annually elected chief magistrates of the Roman republic
Empire- Usually is the royal family, or the Caesar family, these usually have their titles passed down through family(?), unless there is a coup, and another family takes it over (which happened often towards the end of the empire)
hope this helps