Emperor

Emperor is the Stand of Hol Horse featured in Stardust Crusaders.

Appearance
Emperor is a Stand in the form of an elaborate, impractical looking revolver. A metal frame covers the long barrel under which is positioned a cylinder with no apparent use. It has no sight and a large sphere is embedded in the metal frame between the hammer and the barrel.

Hol Horse summons it directly into his hand.

Araki comments that its design is that of a revolver combined with an automatic pistol.

Abilities
As a gun Stand, Emperor functions as a weapon for Hol Horse. Due to its straightforward nature, Hol Horse must compensate through cooperation with allies to gain the upper hand.

Homing Bullets
The characteristic ability of Emperor, and its most dangerous, is its ability to freely control the trajectory of its bullets as they are also a part of the Stand.

Hol Horse is able to control the bullets with enough precision that he was able to circle Silver Chariot's sword with no lag time, do a u-turn , and have them navigate through a narrow conduit without seeing them.

Point-Blank Summon
One of the lesser properties of Emperor is that Hol Horse summons it directly in his hand. It allows him to perform sneak attacks and in a contest of summoning speed, Hol Horse is able to attack first.

Trivia

 * Araki came up with the idea of Emperor by thinking that it'd be novel to have a gun instantly appear in a user's hand, rather than having to draw it from a holster.