Despite his dark and violent characterization, Marvel has already demonstrated that the Punisher can be integrated into the MCU. The MCU typically maintains a family-friendly tone for its movies, aiming for both old and young viewers.
The Punisher poses a potential conflict for this, as he is traditionally depicted in extremely violent narratives, bestowing gruesome justice upon Marvel Comics’ criminals. Though these seem initially incongruous, Marvel has already proven how the Punisher could be introduced into the MCU timeline, and perhaps the perfect method, too. Jon Bernthal’s Frank Castle will star in the MCU’s Daredevil: Born Again, reestablishing the character officially in the Marvel Cinematic Universe.
Bernthal’s Punisher first appeared in Netflix’s Daredevil as part of The Defenders saga. The numerous Netflix series were aimed at a more mature audience, depicting the Punisher in all his grisly glory.
Marvel has since confirmed that The Defenders is considered canon after some years of ambiguity, prompting speculation over how the Punisher’s unique brand of justice could appear in a PG-13 Marvel project in the future. However, Marvel has already provided the solution several decades ago.