Knuckle features as a knight in the Chain Chronicle universe, defined by his gleaming golden armor and prioritization of personal fame over abstract ideals like world peace. Expelled from a holy order due to his attitude, he sustains a flamboyant image through extravagant spending, leading to chronic poverty despite his ostentatious appearance. His core motivation revolves around seeking recognition, epitomized by his boast: "I shine so brightly that the sun would envy me!" This pursuit drives impractical decisions, notably his insistence on wearing attention-grabbing gold armor that exacerbates his financial strain. A pivotal evolution occurs when he acquires an even shinier upgraded suit; to harness its power, he rigorously hones his swordsmanship, yet this enhancement deepens his debts, perpetuating his cycle of spectacle and impoverishment.

As a blade-wielding knight, his early incarnation, Tomcat Knight Knuckle, employs the skill "Impact Tackle" to inflict concentrated damage on single foes. His evolved Solar Knight form utilizes "Golden Tackle," an area-of-effect strike that damages multiple enemies and knocks them backward. Unique abilities include "Volunteer Army Nuisance," increasing ally experience gain by 30% while reducing acquired gold by the same percentage, mirroring his focus on glory over wealth. "Golden Hero" reflects 80% of ranged attack damage once every three blocks, and his chain ability "Gilded Light" amplifies experience gains while enhancing his combat efficacy in urban settings.

Beyond the core narrative, the OVA exaggerates his armor’s luminosity for comedy, depicting it as emitting a literal glow in darkness. The manga *Chain Chronicle Crimson* shows him attempting tactical uses of his armor’s reflectiveness, like luring monsters—a plan met with initial failure but later success in retrieving stolen items, albeit amid circumstances humorously implying his demise.