It's been awhile, but I finally introduced enough OC Stands in my story to warrant a fifth series.

Rolling Turtle
User: Kewtri Truex
Ability: Rolling Turtle simply creates an impenetrable shell around Kewtri, though he is able to maintain high-speeds even with the shell up, making him a weaponless tank. It's weakness is that it cannot protect underneath Kewtri, and there's a small gap designed to allow airflow, which a cunning or specialized Stand user can take advantage of.
Power: E
Speed: B
Range: D
Durability: A
Precision: D
Potential: E

Rainbow Phoenix
User: Michael Phoenix
Ability: Rainbow Phoenix creates a phoenix construct made of flame around Michael. It can act as both shield and weapon, but is vulnerable to water.
Power: B
Speed: A
Range: B
Durability: B
Precision: C
Potential: E

Dark Schneider
User: Mario DeBorne
Ability: Dark Schneider has the ability to compress all events experienced by living beings within a single city from one year to just five minutes. While it cannot control the natural flow of time, meaning seasons are unaffected, it can cause a person to be in multiple places at once. It also can affect the environment if a man-made event already did so, such as park rangers affecting a forest fire. Once the five minutes are up, all events return to normal, leaving regular people with a sense of deja vu, although Stand users will recognize the phenomenon. During the five-minute compression, Dark Schneider can generate concentrated bursts of energy to attack. Additionally, if any version of a person that existed outside the five minute span gets killed, it will not stick. This is to avoid a time paradox.
Power: A
Speed: B
Range: A
Durability: C
Precision: B
Potential: C

Music in the Trees
User: Himari "Fluttershy" Utsukushicho
Ability: Music in the Trees is a Stand of nature. Its most used ability is the power to create and manipulate plants. This is more than just growing them, as Fluttershy can alter their biology as she pleases, such as making leaves as sharp as blades, or making shields of bark as strong as steel. It can also grow smaller and simpler animals, such as plankton or coral. Speaking of animals, Music in the Trees lets Fluttershy understand and communicate with them. She can always sense where one is, and if her Stand touches one, it can suddenly speak in a language that everyone, even non-Stand users, can hear and understand. The effect lasts until Fluttershy decided to turn it off.
Power: A
Speed: B
Range: B
Durability: A
Precision: B
Potential: C

Beautiful Stranger
User: DeKurliss
Ability: A Stand strictly meant for reconnaissance, Beautiful Stranger binds itself to a hand mirror, turning it more ornate. Using it, DeKurliss can think of whoever he wishes to spy upon and can see them and their actions regardless of how far away they are or wherever they are hiding.
Power: E
Speed: E
Range: A
Durability: A
Precision: A
Potential: D

Ra
User: Jonathan Joestar
Ability: Ra possesses control over light energy, the wavelength of which can be altered to either act like as a source of illumination, or even possess energy equal to the sun's rays. As one might expect given Jonathan's history, Ra is perfectly capable of channeling Hamon energy and is in fact designed for it, allowing it to act as a second fighter should Jonathan be surrounded by undead.
Power: A
Speed: A
Range: B
Durability: B
Precision: A
Potential: C

Nut
User: Tomomi Shiobana
Ability: Nut can manipulate wind currents at Tomomi's will, usually in the form of weapons. She can fire off an air bullet like shooting from a gun, or create a blade made from a solid air current. She can also generate a current that can contain a person, though they can be freed from it if they sneeze. Which leads into Nut's biggest weakness. Once an air current is controlled by Tomomi, it's speed becomes constant, and can be negated by a stronger air current, especially her projectiles.
Power: B
Speed: B
Range: A
Durability: A
Precision: C
Potential: B

Smile
User: Diane "Pinkie Pie" Hanasakura
Ability: Smile conjures a cartoon world that spreads to the edges of the territory Pinkie is currently within. The toon world looks identical to the real world and exists alongside it, intersecting slightly so that people or objects in one world can interact with the other. Within the toon world, Pinkie can create all kinds of familiar cartoon gags. This renders herself unkillable while her Stand is active. This protection extends to anyone aware of her Stand, allowing them the same freedom of reality, though Pinkie can tune someone out if she needs to damage them. If Pinkie takes enough damage while in the toon world, it can render her dizzy to the point where her consciousness can start to fade, a dangerous state if she should slip since it usually takes fatal damage to bring her to that point. But if she can stay awake long enough, her control will reassert itself, allowing her to heal and continue fighting.
Power: A
Speed: A
Range: B
Durability: A
Precision: A
Potential: C

Under Pressure
User: Kosaku Kawajiri
Ability: Under Pressure controls various forms of physical pressure, from increasing the PSI of machinery to manipulating atmospheric pressure in a localized area. A common use of this power is to pin someone in a certain location, and the pressure can be increased to cause them to suffocate. In addition, Under Pressure is a competent fighter in its own right.
Power: A
Speed: B
Range: B
Durability: A
Precision: A
Potential: C

Party in the CIA
User: Hayato Kawajiri
Ability: Party in the CIA takes the form of a camcorder and can be hooked up to physical surveillance equipment. When pointed at any building's window, Party in the CIA let's that equipment monitor the interior of that building, as if Hayato had installed it personally. The range of what can be seen is only limited by current technology, and of course there are no actual bugs or cameras to find should someone suspect Hayato is watching them. In addition, Party in the CIA's nature means it is visible to ordinary people and they can even carry it with them. When they do, Hayato can get real-time footage of what the camcorder sees on any monitor. Its only downside is that it's completely useless for combat, being made strictly for surveillance.
Power: E
Speed: E
Range: A
Durability: B
Precision: A
Potential: A