Macaronia is a Sweetspet, a Jewelpet type linked to sweets. This female character takes the form of a Holland Lop rabbit crafted from macarons. Her form combines a primarily white body with light pink hands and feet. Her ears feature pink inner sections and hot pink tips. Magenta and blue heterochromatic eyes are distinctive features, along with a light pink macaron-shaped tail. She typically wears a pink frilly cap topped with a cherry and a blue beaded necklace holding an attached green macaron.

Originating from Sweetsland in the Jewelpet universe, Macaronia generally fills supporting roles. She first appears attending a Christmas celebration in episode 38a of "Jewelpet Sunshine." Later, in episode 19 of "Jewelpet Kira☆Deco!," she offers sweets to celestial stars. Her most significant role occurs in the theatrical film "Jewelpet the Movie: Sweets Dance Princess," where her recognized confectionery skill leads to her task of creating Princess Mana's birthday cake.

Visual depictions sometimes show her carrying a basket filled with macarons, emphasizing her thematic connection to this sweet. The documented sources indicate appearances limited to these instances, with no substantial character development, backstory expansion, or appearances in other seasons, OVAs, or spin-off media.