- “Let me guess, you want to know how to throw a wingstick? Ain't easy, friend.”
- ―Loosum Hagar, to the protagonist
After Nicholas Raine is rescued by Dan and brought back to Ray's Oasis, Loosum offers to train him in the use of wingsticks. If Raine completes the training course to Loosum's specifications, he will be able to purchase wingsticks from her uncle, Halek Hagar.
In the novel, Loosum has a larger impact on Raine's actions, providing more information on the surrounding wasteland upon their first meeting. She is later taken prisoner by the Authority after Dan is captured, interrogated, and fails to provide information on Raine's whereabouts, in order to prevent the Authority from capturing him. Later, as Nicholas enters the Authority Prison, she is found alongside John Marshall as a prisoner. She gives her life battling a horde of mutants to allow the protagonist and the injured captain escape.
- Loosum Hagar is voiced by American actress Amanda Troop.
- The name Loosum was originally intended to be a play on the idiom "you win some, you lose some." During development she was to have a sister named Winsum, who suffered from disfiguration to her face.
- By the time of RAGE 2, Loosum, now 47, is the mayor of Wellspring.