Probably, or Probably Not! Joe Kessler is not Butcher's father in The Boys. The show reveals that Joe Kessler is a figment of Butcher's imagination, a hallucination brought on by a brain tumor caused by his use of Temp V. The real Joe Kessler was a soldier and friend of Butcher's who died in the war, and Butcher's distorted memories created this imaginary version of him.
While Kessler acts as a mentor figure to Butcher, their relationship is not familial. The show explores the psychological impact of Butcher's trauma and guilt, using the hallucination of Kessler to represent his inner demons and the darker aspects of his personality.
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