Lina

Lina is a Caster and one of the people spawned in the Tutorial with Jake,

Lina and Dennis are mentioned as energetic twin cousins always arguing pointlessly,

Story Summary
Lina, Dennis and their colleagues ; Jake, Jacob, Bertram, Caroline, Casper, Ahmed, Theodore and Joanna spawned in the Tutorial together, He and his group joined Richard after Jake left, They were separated by Richard into other hunting group,

Jacob mentioned Lina and Dennis were ambushed by Hayden's members during negotiations with said group, But they claimed that it was not them, so it could most probably be William's deed, This occurred even before Jake made out of his Challenge Dungeon,

Alternate Events if Jake's Bloodline did not exist
The Malefic Viper mentioned that Dennis, Lina and Jake would die on their first night's watch in the Tutorial if not for Jake's Bloodline anomaly,