Sercia's culture reflects its background of ethnically proto-Belkan and Yuke people. Sercian ethnicity is rather vague; as most pre-unification family lines have been diluted through breeding with ethnic Yukes, Sercian identity is more based on a family's time spent in Sercia as opposed to more recent Yuktobanian immigrants. The Sercian language shows many signs of its pre-Yuktobanian past; written in Anean script - though written in Cyrillic script in the 1910s through 1980s as a political concession - and linguistically almost unaltered from its regional roots, its Yuktobanian influence is limited to an influx of words in the 12th and 13th Centuries that were eventually altered by Sercian speakers. In terms of religion Sercia is also distinct from Yuktobania; as of the turn of the millennium almost 80% of Sercia was Catholic as the Garo regime refused to accept Yuktobanian Orthodoxy. Irreligious persons were the second largest group at 10% of the population. With an abnormally low birth rate, Sercia's population is expected to decline over the course of the 21st Century, but analysts do not expect this to significantly impact its current economic growth rate.
Modern Sercian culture has generally accepted globalizing Western influence as a more palatable alternative to Yuktobanian ethnocentric culture; this, combined with the large presence of foreign corporations and nationals in Sercia have made Osean popular culture a pervasive facet of the newly independent state. Traditionalist movements are present in opposition to Western influence, but are politically insignificant and limited to fundamentalist Catholics, neo-Paganists, and recent Yuktobanian immigrants. This drastic, rapid change in culture has been blamed for Sercia's enormous suicide rates - 40 per 100,000 people - the highest in the world, but there is much sociological debate on the matter, with others attributing it to widespread alcoholism in the older generations, depression from the Garo regime's autocratic domestic policies, and copycat behavior of sensationalistic media coverage of other suicides. Older Sercians are typically seen as highly pessimistic, but younger generations are generally in better mental health and more optimistic than those who suffered under the Garos' rule.
Within Sercia's younger generations there are outlying subcultures; ethnic Yuktobanians are critical of the Republic and seek a state based on true Communism while wealthier children have embraced Osean culture to an extreme, where many speak Western in their everyday lives rather than Sercian. Economically disadvantaged youth have turned to evangelical Christianity and see the Republic as a godless, secular nation doomed to fail. The vast majority tend to be politically and religiously apathetic, however and are making the most of living in a country with exceptionally low poverty and unemployment rates - although economists anticipate a brief downturn when their parents reach retirement age.