There might be complications, but the simplest way is to remove an entry from CivilizationLeaders. Heres an example of a CivilizationLeaders Entry:
Code:
INSERT INTO CivilizationLeaders(LeaderType, CivilizationType, CapitalName) VALUES
('SLTH_LEADER_TEST', 'CIVILIZATION_ENGLAND', 'LOC_CITY_ENGLAND_1_NAME');
So to get rid of it, you could just do
DELETE FROM CivilizationLeaders WHERE LeaderType='LUDWIG_OR_WHATEVER' and CivilizationType='WHATEVER_GERMANY_REFERENCE_IS';
You will also probably need to delete an entry from the frontend Players table too, so he isnt pickable as Germany when starting a game as that would probably break stuff
DELETE FROM Players WHERE LeaderType='LUDWIG_OR_WHATEVER' and CivilizationType='WHATEVER_GERMANY_REFERENCE_IS';