Shizuka Joestar

"It's an invisible baby!"

- Josuke Higashikata about Shizuka

Shizuka Joestar (静・ジョースター) is a tertiary ally featured in the fourth part of the JoJo's Bizarre Adventure series, Diamond is Unbreakable.

Introduced in the "We Picked Up Something Crazy!" story arc, Shizuka is a baby found on the side of a road in Morioh by Joseph Joestar, who subsequently adopts her. She is a Stand user who can turn invisible with her Achtung Baby.

Appearance
Shizuka is a female infant approximately 6 months in age. Her face is made visible only when covered by makeup, upon which Joseph and Josuke agree that she is cute.

She wears a range of soft, light baby clothing, including a small, bobbled knit cap, and large, dark glasses to hide her invisible eyes.

Personality
Shizuka is a baby of average temperament who is generally calm outside a few key moments in the story.

Her Stand activates when she is startled, frightened, or distressed, rendering her invisible. This phenomenon is noted to likely be a result of stress built up from being held by strangers other than her mother, however after introductory arc, she seems most comfortable when around Joseph Joestar.

Stand
Shizuka's Stand, Achtung Baby, renders her invisible; as well as everything inside a certain sphere around her when particularly distressed.

Diamond is Unbreakable
For unexplained reasons, Shizuka was a baby lost in Morioh, probably because of her Stand power Achtung Baby, which can turn herself and her close surroundings invisible.

Upon discovering her, Joseph Joestar and Josuke Higashikata are thrown into a wild chase to find her, during which Joseph proves his worthiness to Josuke by slitting his wrist so that his blood would be able to track her location. From then on, Josuke saw his father as more than just any "old man" and instead recognized him as someone willing to place himself in danger for the sake of protecting an innocent life.

She briefly appeared during the Cinderella arc being held by Joseph as he and Josuke are walking and encounter Yukako. When Joseph and Josuke go to the Kameyu department store with Koichi, Rohan, Yukako, and Koichi's mother and sister, she is startled when Rohan takes pictures with flash, forcing Josuke and Joseph to rush outside as the stress caused her to turn herself and her surroundings invisible. Joseph accidentally pushes Koichi into Yukako while trying to calm Shizuka and get out of the store. Shizuka helped Rohan Kishibe when he was attacked by Ken Oyanagi. To win the last rock-paper-scissors match, Rohan used his Heaven's Door on Shizuka to make her force Ken's hand to use rock, allowing him to win the match no matter what Ken decided to choose. She was held hostage by Ken, but Rohan convinced him to let her go in exchange for another rock-paper-scissors match. Rohan used her to defeat Ken by using his Stand to make her activate her own and make Ken throw rock instead of scissors. She goes missing after Ken's and Rohan's battle and they, Josuke and Joseph look for her.

For the rest of the series, Shizuka remains mostly carried by Joseph, who had adopted her into his family despite risking the wrath of his wife Suzi Q suspecting her to be another illegitimate child of his. Her real parents were never found.

Trivia

 * Shizuka's name can also be read as (じょう Jō), which when paired with her adoptive surname would make her name Jō Jōsutā.
 * In an interview during the run of Stone Ocean in 2003, when asked if Shizuka would return, Araki said that she would not.