Cocoa Arara holds the title of second princess in the Arara Kingdom and stands as the elder sister of Milk Arara, placing her second in line for the throne. A key member of the Holy Sisters, she plays a pivotal role in bolstering the protagonists with her STEM expertise, navigating intricate challenges and crafting strategic solutions. Her engineering prowess shines in constructing advanced machinery like the "Stan Han-sen" airship and "Hulk Ho-kan" spaceship, cementing her reputation as a gadgeteer genius.

Spiral glasses mask her striking beauty, a trait that astonishes others when removed, aligning with the "Hollywood Homely" trope. Her vision impairment necessitates the glasses, underscoring her "Blind Without ‘Em" characteristic.

Cocoa epitomizes the absent-minded professor archetype, often drifting into distraction and speaking with deliberate slowness. Though highly intelligent, she struggles with diffidence outside her technical domain, sparking comedic mishaps. Beneath these quirks lies steadfast loyalty and resilience, particularly evident when defending allies or her kingdom.

Her narrative deepens with pivotal developments in a sequel series, where an antagonist’s influence brainwashes her into an "Evil Costume Switch." Donning a dominatrix-inspired outfit and wielding a lightsaber, she temporarily turns against her allies. This arc culminates in a combined energy attack that petrifies her alongside others, though she is later restored.

Her past life as Princess Cocoa intertwines with the kingdom’s founder Ramunes, adding legacy weight to her identity. Familial ties with sisters Milk and the later-revealed Cafe au Lait (Lesqua) anchor her collaborative dynamics, pivotal in joint endeavors such as OVA storyline disguises deployed to thwart adversaries.

Across media iterations, Cocoa balances comedic charm with strategic indispensability, remaining a cornerstone of support within the narrative’s evolving tapestry.