Lip is one-third of the trio Mouth, alongside Teeth and Tongue. Identical triplets, they move as a unified force in combat, mirroring the interdependent mechanics of their namesakes in human speech. Their flawless coordination enables precise, synchronized strikes, though their individual resilience and combat prowess diminish significantly when separated.

Recruited by a prison warden to subdue Iron Michael, a former heavyweight boxer, the trio initially overpowered him using relentless, harmonized boxing tactics. Their assault faltered when Jun Guevaru intervened, swiftly incapacitating one member. The surviving pair retreated, abandoning their mission and revealing a core vulnerability: the trio’s effectiveness collapses entirely if even one member is neutralized.

Lip’s identity remains inseparable from the group, with no documented history, personal motives, or individual endeavors beyond collective operations. The character exists solely within the trio’s shared dynamic, devoid of independent arcs or evolution in established narratives.