Narciso Anasui, sometimes localized as Narciso Anastasia, serves a sentence for first-degree murder at Green Dolphin Street Prison. His conviction followed the disassembly of his girlfriend and her lover after discovering their infidelity at age 21, an act rooted in a childhood compulsion to meticulously disassemble objects like toys, clocks, a neighbor's Porsche, and a high-voltage telephone pole, which previously led to six months of institutionalization at age ten.
Anasui possesses an androgynous appearance, pink hair, and above-average height. His typical attire includes a studded flat hat, a form-fitting fishnet mesh top exposing his chest, a studded belt with a waist skirt, and thigh-high boots. Three footprint decorations mark his abdomen, chest, and waist skirt, reflecting his Stand's powers. While early manga depictions featured more feminine traits, later designs and the anime consistently present him with masculine features.
He wields the Stand Diver Down, a close-range entity specializing in energy manipulation and physical restructuring. Diver Down phases through solid materials, stores kinetic energy within objects or living beings for delayed release, and rearranges molecular structures. This enables tactics such as embedding attacks in surfaces as traps, modifying enemy body parts into springs, or absorbing damage directed at allies before counterattacking.
Anasui's personality blends analytical observation with intense, often disturbing fixations. Emporio Alniño describes him as untrustworthy and potentially unstable without Weather Report's influence. He openly prioritizes self-interest, stating he wouldn't sacrifice himself for his parents but would for Jolyne Cujoh, whom he idolizes after learning of her determination. His obsession manifests in repeated marriage proposals, attempts to manipulate situations to "rescue" her—including conspiring with Foo Fighters to trip her—and boundary-crossing actions like nibbling flowers grown from her skin. He shows minimal regard for those outside his small circle of respect, initially Weather Report and later Foo Fighters after she saves his life.
Within Green Dolphin Street, Anasui allies with Jolyne following Foo Fighters' request for aid. He negotiates a promise from Foo Fighters to ensure Jolyne marries him in exchange for protection. During battles, he demonstrates strategic skill: analyzing Kenzou's Dragon's Dream Stand and its feng shui mechanics, repurposing Guccio's body into a booby trap via rib manipulation, and deducing the Green Baby's Stand properties through experimentation. He consistently prioritizes Jolyne's safety, using Diver Down to remove parasitic flowers from her body or shielding her from sunlight to prevent regrowth.
After escaping prison, Anasui joins the pursuit of Enrico Pucci to Cape Canaveral. He fights Pucci's evolved Stands, using Diver Down to absorb C-Moon's gravity inversion, creating an opening for Jolyne. His willingness for sacrifice peaks when he devises a plan to embed Jotaro Kujo's memory disc into his own fatally wounded body, though Foo Fighters retrieves it before his death. Anasui is killed during the final confrontation with Made in Heaven as Pucci accelerates time.
Following the universe's reset after Pucci's defeat, Anasui is reincarnated as Annakiss. In this new timeline, he plans to marry Irene (Jolyne's counterpart) and seeks approval from her father during their drive to meet him, accompanied by Emporio and hitchhikers resembling Ermes and Weather Report.