Marine is the 1sth human SOUL also known as Patience, she is really calm and kind and gets mad rarely, usually she likes staying along with the other SOULs since she doesn't like being alone, like everyone else she died against Asgore but she doesn't mind about it and tries to move on (if you're wondering, no she's not the Marine from the comic she is a completely different character even if some things are references to the comic)