Mercury Black

Mercury Black  is an associate of Cinder and a possible partner of Emerald.

Appearance
In Mercury's first appearance in Black and White, he was shown to be a pale, well-built man with purple eyes and hair, partially slicked back while unkempt at the front. He also wears a gray and black two-tone partial-zip jacket, that covers his upper body.

Mercury's appearance did not change much in Volume 2, though his hair and eyes are now a silvery-gray. A not so noticeable change is his style of belt. In his first appearance, he appears to be wearing two belts, one crossing the other. He now wears a single notched belt with what appears to be a sash or bandana draped over it. It is unclear whether his rerebraces are attached to his jacket.

In the Volume 2 Opening, he is seen fighting with greaves similar in design to Yang's Ember Celica.

Personality
Though little is shown in the way of how he interacts with others, Mercury displays a sense of seriousness and levelheadedness. Based on his fight with Pyrrha, he appears to test and gauge his opponent before fully committing to an attack, implying that he has a strategic mind.

Also, something noticeable during the sneak peek is Mercury's lack of using the firing mechanism on his greaves. This could imply that he is a very confident and proficient fighter who feels no need to use his full range of abilities, even in a fight against a strong opponent like Pyrrha.

As of Best Day Ever, Mercury is shown to be rather care-free and jokes around when in the company of Emerald, who makes an effort to annoy Mercury.

Abilities
Based on his sneak-peek fight with Pyrrha, Mercury is shown to be a very acrobatic and agile fighter who relies on quickly overpowering his opponent with complex kicks that imply a near-mastery of martial arts that resemble Tae Kwon Do. He was even able to outmaneuver and disarm Pyrrha, although the entirety of the match was not shown.

He also wields a set of greaves that have a firing mechanism built into them similar to Ember Celica. He is shown using them briefly in the Volume 2 Opening, which shows that they operate the same way Ember Celica does.

During his and Emerald's brief skirmish with Tukson, Mercury is shown using his greaves for a spilt second with the sound of a gunshot going off, meaning that he may have delivered the deathblow to Tukson himself.

Trivia

 * Both Mercury and Emerald lacked 3D models in Volume One, using 2D still image sprites instead.
 * Despite his hair and eye color being purple in Black and White, his silhouette and the official poster for Volume 2 show his hair as silvery-gray. His initial appearance is in a very dark setting, which may be why his hair and eyes seem to be purple.
 * Mercury seems to be based off the Roman mythological figure of the same name.