Billy Loomis is a fictional character and the antagonist of the Scream series of films, created by screenwriter Kevin Williamson. The role was portrayed by actor Skeet Ulrich

Some facts about Billy Loomis's life:
He was born to Hank and Nancy Loomis.
He started dating Sydney Prescott at some point and became friends with Stu Macher.
Hank Loomis had an affair with Sydney's mother, Maureen, and after this was revealed, Nancy Loomis left, which had a significant impact on Billy's life.
Roman Bridger showed Billy a video of Hank having an affair with Maureen and convinced him to kill her.
It is possible that before or during the Woodsbury murders, Billy slept with another girl, and she gave birth to his daughter, Samantha Carpenter.
Billy was a fan of horror movies and used his knowledge of them to orchestrate his crimes.
His anger and sense of abandonment led him to violence.
Billy was manipulative, able to conceal his true nature and convince Stu to join his criminal plans.