You can add your name in the names files and in descr_strat.txt as a starting faction leader. In descr_names.txt you need to look for the section of the faction you want and add the name to the first list and the surname to the ... surnames list. Then you need to add them in the file names.txt following the example there and then you need to edit the descr_strat.txt to change the starting faction leader with your name. For example(replacing Flavius Julius from the romans julii in vanilla rtw):
Code:
character Siddhi Surname, named character, leader, age 47, , x 89, y 82
And you also need to replace it in the relatives line bellow:
Code:
relative Siddhi Surname, Faustina, Lucius Julius, Quintus Julius, Vibius Julius, end
Then you need to make sure that the descendants (those having the Julius surname in this example are updated to have your surname next to their name).
Then remove the map.rwm file found in Rome - Total War/data/world/maps/base if you`re playing vanilla RTW so that it can be regenerated based on the new info when you start the game the next time. You`ll be on the map at the start of the campaign. The name and surname might be used by other future characters though. You might be able to avoid this, but it`s a bit more complicated.
If you need more than these very general directions ask.