After her victory in yesterday's election, Roman, 49, is being seen by the lesbian, gay, bisexual and transgender (LGBT) community as a source of hope in a country where Church influence means divorce, abortion and same-sex marriage are banned.
"The politics of bigotry, hatred and discrimination did not triumph. What triumphed was the politics of love, acceptance and respect," Roman told AFP after her victory for a seat in Congress representing the farming province of Bataan just northwest of Manila.
"I'm elated, very, very happy. I'm also excited to work. I realise that the burden is bigger because the stereotype of people about the LGBT is we are frivolous, that we have nothing substantial to say, so I have to prove them wrong," she said.
Roman will be the highest-ranking openly LGBT politician in the Philippines, where other lawmakers have refused to come out for fear of losing support from the Catholic Church and other religious groups.
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Roman's father was a former congressman whose death in 2014 prompted her to consider continuing the family legacy.
Political families dominate Philippine politics, from the local to the national level, and belonging to such a dynasty was widely regarded as being crucial to Roman's success.
Still the constituents of Bataan overwhelmingly endorsed Roman, with the vote count showing she had secured 62 percent support.
Roman has been living as a woman for two decades, and proudly wore a pearl necklace and pink lipstick while campaigning.
She had a successful career as senior editor at the Spanish News Agency. She speaks Spanish, French and Italian and won a scholarship to study in Spain, where she met her partner of 18 years.
She underwent sex reassignment surgery, and legally changed her name and gender, in the 1990s - a recognition she wants other transgender people to have.