Jammersnark is a significant antagonist that appears in the anime series Princession Orchestra, representing a more dangerous evolution of the monsters that threaten the land of Alicepia. It emerges after the initial defeat of the primary antagonistic group, Band Snatch, and is directly connected to the story's later conflicts involving the enigmatic rulers of Alicepia, the Red Queen and the White Queen. Specifically, Jammersnark is created and summoned by the White Queen as a powerful new type of monster, proving to be a formidable challenge for the Princesses who defend Alicepia. The creature is not an independent actor but a construct of the White Queen's will, formed as her primary method of causing chaos and achieving her objectives after other plans have failed. A transcript from the series reveals that the creature also has a connection to the King of Alicepia, a character named Navue who absorbs the power of the Song Fragments belonging to both the Red and White Queens. It is through this power that Navue is able to resurrect the Band Snatch organization and, notably, summon a Jammersnark, further complicating the creature's origin and allegiance.

In terms of role and abilities, Jammersnark functions as a major threat that the main characters must unite to overcome. Unlike the standard Jammerwocks that appear earlier in the series, which are created by Band Snatch, the Jammersnark possesses significantly greater power and requires a coordinated effort to defeat. Its appearance marks a turning point in the conflict, escalating the stakes for the Princess Ripple, Princess Zeal, and Princess Meteor. The creature is not merely a physical menace but also a symbolic one, representing the combined or corrupted power of the Queens themselves. The series shows that Jammersnark directly targets the protagonists and the people of Alicepia, with multiple episodes depicting its attempts to harm or "finish" the Princesses and innocent bystanders during the Princess Festival. The Princesses' standard methods of fighting are often insufficient against it, forcing them and their allies to find new strategies. For instance, in one significant confrontation, it is not a Princess attack that stops the creature, but an invention created by a supporting character, Manabi Hakase, highlighting the unique threat Jammersnark poses. Another episode summary describes how, during a decisive battle against the White Queen, everyone present at the Princess Festival venue must desperately work together to hold back the Jammersnark, as the overwhelming might of the White Queen surpasses that of the transformed Princesses. This demonstrates that the creature is an extension of the Queen's power, requiring collective resistance rather than a simple heroic victory.

The creature's personality is not explored, as it serves as a force of nature or a weapon rather than a character with individual motivations or dialogue. Its behavior is defined solely by its destructive purpose, instilling fear and disorder wherever it appears. The only relationships that define Jammersnark are those with its creators and summoners, the White Queen and King Navue, and its adversaries: the Princesses and the citizens of Alicepia. Its development is tied directly to the plot's progression, appearing as a late-stage adversary after the initial villains have been dealt with. It represents an escalation in the conflict and forces the protagonists to grow beyond their previous limits. While extensive background on its exact nature or a detailed account of its development over the series remains limited to episode synopses and basic character listings, the available information consistently portrays Jammersnark as a pivotal and powerful antagonist whose creation signals a darker, more desperate chapter in the struggle to protect Alicepia.