Honorary Britannians are Numbers who vow their loyalty to the Holy Britannian Empire. All non-Britannians living in Britannia-conquered Areas are allowed to accept honorary Britannian citizenship as long as they are willing to serve and be loyal to the Empire. Honorary Britannians are legally almost identical to ethnic Britannians: they are allowed to earn special privileges, live in wealthy cities, etc. Socially, however, they are frequently discriminated against on the basis of their racial background. Those who don't wish to serve the Empire become Numbers, and are both barred from living in wealthy cities and face legal discrimination.
Honorary Britannians are sometimes employed by the Britannian Army, typically as separate divisions, and are usually employed for menial warfare such as hunting down rebels in less favorable conditions. Suzaku Kururugi is the first and only honorary Britannian to become a knight, and the only non-Britannian in the Knights of the Round. Shin Hyuga Shaing, the leader of the Knights of St. Michael in Euro Britannia, may also be an honorary Britannian.
Opposing this system is the Blood-Purist Faction, which seeks to abolish the honorary Britannian system, and expel all non-Britannians from within the military.