Short answers, pulled from the story.
Heather Mason is the seventeen-year-old protagonist of Silent Hill 3 who was manufactured from the hatred of a cult and the blood of a dying girl. She serves as the vessel for a malevolent deity and the instrument of destruction for the Order.
Claudia Wolf is the true antagonist of Silent Hill 3 and the architect of Heather's suffering. She was once the childhood friend of Alessa Gillespie and seeks to complete the ritual by forcing Heather to give birth to the god of the Order.
The development team known as Team Silent scrapped the initial rail shooter concept in September 2002 after spending considerable time and budget on it. They then had to rebuild the game from scratch in less than nine months to create the final version.
Akira Yamaoka composed the soundtrack for Silent Hill 3 which marked a significant shift in the series audio landscape. Most of the vocalized tracks were performed by Mary Elizabeth McGlynn who was credited as Melissa Williamson.
The soundtrack for Silent Hill 3 was released in Europe on the 25th of March 2003 and in Japan on the 16th of July 2003. It has since become a beloved part of the Silent Hill legacy.
Silent Hill 3 sold over 300,000 copies by November 2003 and topped sales charts in Japan upon its release. The game sold 58,000 copies in the first three days in Japan.