The Green Baby resembles a in appearance, with two lines going down either side of its cranium. It has large, pointy ears and green skin (as seen in ) which is patterned with leaf shapes. It has eyes that resemble seeds. It also has what appears to be a leaf-shaped mark on its forehead and the on its back.
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After being exposed to sunlight, Anasui concluded that the plant must only bloom in sunlight. Jolyne, knowing this, still jumped in to grab the newly forming Green Baby. Soon after, 's invincible automatic Stand swallowed the shell containing the Green Baby, forcing Jolyne and Anasui to accompany Yo-Yo Ma while Foo Fighters hunted down D an G.
After D an G was killed, the Green Baby hatched, removing Jolyne's plant infection due to no longer needing the plants to grow. Anasui and Jolyne then hunt down the Green Baby as it wanders away. Unfortunately they discover that the Green Baby has a Stand which shrinks anything that approaches it. As Jolyne attempts to foil the ability, appears to defend the Green Baby and reduce all threats to nothing.