There are some cases in which the name of a Stand power is either unclear or unknown. This page is to list all such Stands until a name for them has officially been confirmed.
Having been recruited by DIO, Mansaku Nijimura had a Stand, but its appearance and abilities are unknown. As a result of merging with DIO's Flesh Bud after DIO's death, he is seemingly unable to use the Stand anymore.[1]
As members of La Squadra Esecuzioni, it's inferred from Pericolo's remarks in Chapter 469 and the diagram in Chapter 470 that both Sorbet and Gelato possess Stands. However, it is not confirmed that they were able to use them properly.[1]
One of the workers mentioned by Polnareff to Team Bucciarati gained a Stand after hurting himself on Meteorite stone in a volcano. During his coma, he made a spark with his right hand, burning a doctor's fingers.
Emporio's mother had her ability stolen by Pucci before being killed; it's implied that her ability was similar to Emporio's own Burning Down the House.[2]
A Stand belonging to an alternate universe version of Hot Pants. Its appearance and abilities are extremely similar to Cream Starter's. As part of a promise, Funny Valentine pulls the Stand out and hands it to Johnny, who uses it to heal Slow Dancer.
A Stand belonging to Joseph Joestar. While having a vine-like body, it at least has a fully-formed head. The vines appear from his birthmark and wrap around his arms. It appears to have the ability to project vine-like tendrils, not unlike Hermit Purple albeit without the use of the Ripple.
This Stand is only featured in the game Famicom Jump II: Saikyo no Shichinin, where it's used by an enemy simply called Stand User. The Stand allows its user to turn the player into stone with a special punch against anyone his user defeats or is about to defeat in combat. This transformation makes the victims unable to move, however, Stand users affected by it can sense and even talk. This effect can be reverted if the user is defeated. The Stand has neither a name nor a physical shape, but the image of a rock is shown when the Stand User uses it.
The Stand of Kaoru from the The Anatomy Lesson of Dr. Nicolaes Tulp. Its name is unknown, but has the ability to spawn items under Kaoru's skin. In one instance, Kaoru cuts open his skin and gold coins from another country fall out. When used, an aura in the shape of a horned demon appears around Kaoru.
The Stand of an unnamed genius artisan from the Gucci brand, who bound it to a Gucci bag. It is mentioned that three bags with the same ability were made by the artisan, making it possible his Stand can grant its ability to an unlimited number of bags. Anyone can use the bags, even if they are not Stand users themselves. It has the ability to vanish valuable things that the owner keeps in the bag. When the owner of the bag is in trouble, the bag will return the vanished objects in some way (the objects do not appear in the bag, but the owner will recover them in an unexpected event).
Rohan Kishibe's grandmother had one of those bags and gave it to Rohan Kishibe. Rohan, not knowing the ability was due to a Stand, made the Gucci factory fix the bag (probably the artisan unbound his Stand from it), but, after knowing the bag's true nature, the mangaka lamented for not being able to use it anymore.
The series is known for alternating colors between media, the information presented below may or may not be canon.
Colored Manga
Bag
(Brown, green, and red leather with silver buckles and zippers, brown strap, golden casing.)
The Stand of Pannacotta Fugo from the 37th universe in JORGE JOESTAR. It is unused and unseen in the novel, but mentioned by Bruno Bucciarati (Universe 37) when he lists the abilities of all the allies with them. Using the process of elimination, Fugo's Stand appears to be capable of spreading mass delusions to large crowds. Coincidentally, there is a concept of mass hysteria in the novel but it is not related to Fugo's Stand since the concept also exists within the first universe.
The Stand of a parrot that was raised together with Pet Shop. It's a remote control type Stand[3] that appears to be able to possess people from afar through some means, though the extent of its ability is currently unknown.
The Stand is able to materialize rows of punched cards which can invade someone's body. The victim revives memories, which for an unexplained reason are all tied to DIO, and the victim is forced to act as DIO's interlocutor in the memory. The victim becomes unable to control their body but remains aware of what is happening to them.[4] Once the victim is freed from the memory, they throw up the punched cards.