Mercury Black

Mercury Black is a member of the Reborn and honorary uncle for Emerald's babies.

'''This Mercury Black is a different one from RWBY as he is an alternative version of himself in the alternative universe where the Beacons of Darkness exist. '''​​​​​

​​Appearance
His hair and eyes are a silvery-gray. He is shown to be a pale, well-built young man.

Original
He wears a slate gray and black two-tone partial-zip jacket that covers his upper body and a single notched belt with what appears to be a sash or bandana draped over it. Protecting his arms are a set of rerebraces and vambraces. He has prosthetic legs that attach part-way up his thighs. These legs are usually hidden from view due to him wearing pants and a pair of shoes. His armor hides what appears to be oddly-shaped scars on the outer sides and backs of both of his arms.

Haven Uniform
While at Beacon Academy, Mercury wears the Haven Academy uniform, which consists of a dark gray outfit with a long-sleeved collared top, black pants, and a white armband.

Personality
Mercury is shown to be rather care-free and jokes around when in the company of Emerald, who he makes an effort to annoy. He seems to opt for excitement and action; he dislikes books without pictures and tells Emerald he finds the city boring. However, when it comes to matters at hand, Mercury displays a sense of seriousness and levelheadedness. However, his carefree attitude may occasionally slip out during combat. He appears to test and gauge his opponent before fully committing to an attack, showing he has a strategic mind and cunning.

Mercury also seems to derive personal enjoyment from the pain of others, showing no qualms about intimidating and killing others, even light-heartedly joking about it afterward with Emerald. He, however, despite his sadistic streak, he is not incapable of caring for others as he has proven many times to care about his friends and have a good relation with them.

Mercury carries an immense bitterness within him due to his abusive upbringing by his assassin father, Marcus. This bitterness holds over due to the fact that Marcus used his Semblance to steal Mercury's, which he said would return if Mercury became strong enough, which he proved the moment he killed his father. This turned out to be a lie, his father abused him physically and emotionally and that he used to constantly beat him up and call it 'training' while telling him that he was weak and relying on crutches, making it obvious he suffered a miserable upbringing filled with hate and misery.

Talaria
Mercury's Boots are shown to be able to fire a variety of different projectiles. Some of the projectiles are shown to have guided or target-seeking properties, taking spiraling paths towards their target. By using a fighting style akin to break-dancing or Capoeira, Mercury can fire a veritable storm of these projectiles that can overwhelm an enemy with sheer volume. Some projectiles can also create a smoke or steam effect that can be used to distract or damage enemies. Mercury also uses the boots to absorb or block a very powerful blows. He can also use the boots to jump in midair.

His prosthetics are shown capable of firing projectiles like his boots, despite the fact that no ammunition or barrels are visible on the prosthetics. It appears that his prosthetics are responsible for the air blasts that he fires, while his boots are responsible for the bullets he fires.

Weakness
His biggest weakness is not having a semblance but until now it hasn't been a problem and many good warriors didn't have it either.