Tusk

Tusk (牙 (タスク)) is the Stand of Johnny Joestar, featured in Part VII: Steel Ball Run.

Like Part IV's Echoes, Tusk takes various forms.

Ability
Tusk ACT 1 defines Johnny's ability to Spin his fingernails at high speed and shoot them, as projectiles akin to bullets. Once Johnny shoots a fingernail, they take a short time to grow back.
 * Quick-Spin Nails

Development
It appears that Johnny is granted his Stand by the marriage of the power of The Corpse's Left Arm, found in the desert, and Gyro Zeppeli's elementary tutelage in the way of the Spin.

Appearance
ACT 1 recalls a small, neotenous animal. Its head is of equal or slightly greater size than its body, and it floats, with two short, vague and inarticulate arms and one such leg. Its posterior is marked somewhat irregularly by small stars, behind which dark circles radiate to their points; while four tendrils droop from the base of its trunk to the approximate length of its leg, bearing heart shapes.

On its head, it bears two long, mammalian ears; small, reflective black eyes, under a brow of a troubled angle; a large star at the top of its forehead, behind which a dark circle radiates to its points, and from the centre of which a string links with the tip of a cone fastened to the region of its nose. Eight wavering vestiges emanate from its head laterally: Two above; four from its sides, the lower of which, at its cheeks, are also surrounded by a dark circle; and one either side of its chin.

Personality
ACT 1 occasionally produces the sound "chumimi~in".

Ability
Once Johnny learns to Spin the fingernails with aureal rotation, thus bringing Tusk to his second form, he can make the holes he produces move: if for example he shoots and produces a hole on a table, he can move the hole on the surface of the table and whatever touches the table's surface. However, the hole leaves a track behind it as it moves.
 * Ten-Aureal Nails

When Johnny shoots a fingernail with aureal rotation, the fingernail takes several minutes to grow back; however, Johnny discovers that by munching herbs or drinking tea he can accelerate the growing process.

Appearance
Mechanical, ACT 2 possesses small, sturdy torso and arms, greater in proportion to its head. From its head hang two barrel-shaped objects. A barrel-like unit the size of its head is suspended at the base of a short, flat spine.

Ability
By shooting himself with a fingernail Spinning with aureal rotation, Johnny is able to send a part of his body through the hole, moving it away from his body. This way he can shoot fingernails from different directions, sending his hands or fingers through the holes.
 * Through The Hole

Development
During the fight against the Stand Civil War, Johnny, in a moment of deep crisis, sees Jesus, who gives him the hint that leads him to discover the third form of Tusk.

Appearance
Distinctly more human in shape, ACT 3 bears sharp spikes growing from both the underside of each of the three toes of its triangular feet, and two from small, truncated, disc-shaped hands. On dark, spherical shoulders it bears the large, bold outline of a star; and from its upper lip to the rear of its head runs a tall, blade-like protrusion resembling a mohawk.

Ability
This Super Spin can pierce through other dimensions, and influence gravity to some extent. The damage caused by the rotation is also infinite and will not end unless Johnny were to apply another similar rotation moving the other way, resulting in them canceling each other out.
 * Infinite Rotation

When hit by one of Johnny's nail bullets, ACT 4 imbues targets with infinite Spinning motion, making them Spin internally. That Spin goes on forever and never leaves the person or their Stand, forcing them to return to the place where they were hit, or its equivalent in each parallel dimension. Tusk can move through both D4C's Love Train and stopped time to reach its target.

The Spin is also transferable between objects, as the Diego Brando from another universe cut his leg off and threw it to Johnny, transferring the infinite rotation to its user. Another example is when Funny Valentine went into a passing car trying to run away from Tusk, the infinite rotation nearly instantly destroyed it, coming back to Valentine.

This ability seems likely to reference the Fleetwood Mac song Landslide, as the lyrics suggest the fate of Funny Valentine when experiencing Tusk 4.

Development
Johnny unlocks Tusk's fourth and final form after receiving Gyro's fifth lesson. The principal behind the technique derives from the use of the Super Spin, which requires Johnny to allow his horse to run in its "natural state". By doing so, the horse produces rotational energy in the form of the Golden Rectangle and by combining it with Tusk, Johnny is able to release infinite rotational energy. Because Act IV derives from his horse's running power, Johnny is typically only able to use it when on his horse. He can, however, shortcut the process as a last ditch effort, using a Steel Ball to temporarily galvanize his horse's movement.

Appearance
ACT 4 is of humanoid shape and broad or square build; of articulate legs, arms, hands and fingers. Its head is mounted on front of its chest, and from the bottom of its chest hangs to its ankles a vestment comprising columns of vertical ellipses, each bottomed by a small triangle. like Johnny, it wears a horseshoe on its forehead.

Personality
Occasionally vocalizing ACT 1's "chumimi~in", ACT 4 punches while making or inciting Johnny's expression of the Kujo family's "ORA ORA ORA" Stand Cry.

Trivia

 * Johnny discovers that by drinking herbal tea, particularly chamomile, he can help his nails grow back faster.
 * Johnny can use his Spinning nails to grate cheese, wind spaghetti, and brush his teeth as though with an electric toothbrush.
 * Tusk (Act 4) is the first Stand to have a battle cry in Part VII. This is especially unique due to most of the Stands in Part VII being tools rather than humanoids. The second being The World.
 * On occation Tusk's kanji is written as "爪" (Nail), rather than "牙" (Tusk).