Base-Breaking Character: Sonia is an incredibly divisive figure in the fandom. Some love her for her unique abilities, her relationship with Alucard, being the mother of Trevor, and being the only female Belmont in the series thus far. Others dislike her for all stated reasons, as well as for being non-canon as confirmed by Word of God.
Fanon: Many people believe that the father of Sonia's child was supposed to be Alucard. While there's no hard proof in-game, the two seem to be close and speak to each other affectionately, and in the best ending Sonia's child is stated to "carry on the fate and tragedy of the Belmont family, and the bloodline of dark ways." As for the dialogue:
Alucard: "Please understand. I am the only one who can make amends for the sins committed by my father, and there is no reason for you to get involved in this battle. Sonia, I could not bear to lose you, too. Now, turn back!" (Theyfight, and then later...) Sonia: "Alucard. I'm so sorry." Alucard: "Do not trouble yourself about it, Sonia. Now, I must sleep. I fear we shall not meet again. Farewell, my beloved, my beautiful vampire hunter." Sonia: "Alucard! Alucard, I will never forget you. Farewell, dear Alucard."
Vindicated by History: The general stance nowadays is that Legends was unfairly criticized back then thanks to the fact that this game came out months after Symphony of the Night and its status as a medium transfer to a portable console kinda destroyed the chances of people liking this game back then. Present day, the story is considered pretty good, the gameplay is at least passable, and the music is different but still good. Even if a player does not like the game, they will at least admit it does not deserve the hate it originally got.