Captain Kriker was a famous pirate in the Portal City area. After his death, his body was reanimated as one of the Skeletal Pirates protecting the Docks. His spirit soon made contact with Abisma, the Royal Necromancer, and offered to deliver a scroll about Necromancy in return for his return from the dead. Abisma agreed, and Kriker returned to life.
As Kriker only appears in Katya's tale, it is unclear if he ever existed.