PARIS — Fatima Daas was used to not reading about people like her. Her debut novel was a chance to remedy this. Based on her own life, that book, “The Last One,” follows a young, lesbian Muslim woman in a tough Paris suburb who struggles to reconcile her conflicting identities. “I grew up with the idea, whether in films or in books, that I did not exist,” Daas, 26, said in a recent phone interview. “I didn’t exist as a young lesbian, Muslim woman, with an immigrant background,” she added. “So the question I have asked myself a lot is, ‘How do we shape ourselves when we have absolutely no representation?’” Representation and identity are fraught topics now in France, a country that prides itself on a universalist tradition that unites all.