Marisa Song is a supporting protagonist in Totally Killer.
Biography[]
Marisa Song was a high school student and a member of "the Mollys", a gang of mean girls that consisted of her, Tiffany Clark, Heather Hernandez and Pam Miller. At some point, Marisa and her friends had been involved in the death of a student they called "Fat Trish", who was rumoured to have had sex with their PE teacher, Coach Zane. The Mollys thus invited Trish to a sleepover at Tiffany's house and got her heavily drunk in an attempt to make her "confess". However, Trish got upset and, after locking herself in Tiffany's room to cry, attempted to drive home whilst still intoxicated, leading to a fatal car crash.
In the original timeline of events, Marisa was murdered on the night of October 29, 1987 -- her 16th birthday -- whilst having a party with her friends at a cabin in the woods. She was stabbed 16 times by a masked Doug Summers, who was looking for revenge for the death of Trish, his former girlfriend. Tiffany had met the same fate two days prior during her 16th birthday, as did Heather two days later.
However, after Pam's future daughter Jamie accidentally time travels back in time to October 27, 1987 from 2023, she decides to register herself into the high school, where she meets the Mollys during gym class and learns of their plans to throw a party at Tiffany's house for her 16th birthday, which is where Tiffany will be murdered. Jamie infiltrates the party and tries to stop the murder, but is too late. Following Tiffany's death, Jamie manages to convince the rest of the girls that she can tell the future, and warns them to stay out of town for the weekend. However, this backfires since Jamie and the girls wind up at the exact cabin where Marisa was killed in the original timeline, where they plan to celebrate Marisa's birthday with their friends Kara, Randy and Blake. That night, the Sweet 16 Killer arrives, but decides to go for Heather instead of Marisa. Despite the rest of the friend group trying to fight back, the killer succeeds in stabbing Heather 16 times, killing her.
The next day, after the remaining friends gather at the police station, Jamie tries giving a sample of the killer's blood to Kara's dad Sheriff Lim, but since DNA testing doesn't really exist in 1987, the cops laugh at and ignore her. Later, whilst watching Norm Dubasage making a news report on the recent murders, Jamie gives Marisa her rape alarm for her own personal safety, and the survivors plan to meet at the local amusement park so Jamie can try and stop the last murder before returning to the present.
Death[]

Marisa's after getting her throat slit
As part of their plan to catch the killer, they get Marisa to go into the amusement park's haunted house, the "Dollhouse of Horrors", alone. The Sweet 16 Killer follows her inside, and the friends spring out an ambush, where Kara manages to kill the killer by impaling him through the back with a scythe. Jamie unmasks the killer, revealing him to be Doug, and she and the others learn of his motives when they find him wearing a locket containing a photo of Trish. Marisa explains how the Mollys caused Trish's death to Jamie, but when Jamie goes to confront her future mom, Pam says that she wasn't involved whatsoever. This confuses Jamie, since, before she time-travelled her mom was apparently murdered by the Sweet 16 killer. Marisa tries to assure everyone that it doesn't matter since the killer is dead, but then a second Sweet 16 killer comes out of nowhere and slits her throat. Marisa tries using the rape alarm Jamie gave her, but then collapses and dies as the killer continues stabbing her corpse.

James gave her death the Golden Chainsaw because it was sudden, bloody, and he thought the gag with the alarm was hilarious.