Kaine Parker is a clone of Peter Parker and one of the characters who has taken on the Scarlet Spider identity in Spider-Man comics and related adaptations. He is portrayed as a darker, more volatile anti-hero than Peter, often struggling with violence, guilt, and redemption. As Scarlet Spider, he acts as a conflicted ally and protector, using spider-like powers to fight crime while wrestling with his own identity and place in the Spider-Man legacy.