What would their costume be and what are their powers/weapons/gadgets?

Mine would wear a black hood and robe. He would be a necromancer and would be a villain.

5356984 mine would be a sexy demoness with a sexy outfit.... ironically I'm a hero!

Silver knight is a superhero.
His power is superspeed, like the Flash and Quicksilver.
His superhero name is: The Excelerator

He wears light armor, similair to the N7 Slayer in Mass effect 3.

Colors
Main: Black
Secondary: Silver
The lights on his armor: Blue

Gadgets: a katana and a hand repulsor like Iron Man.

Ohhhh! Well. AHEM.

I actually have a villan AND hero setup for Onyx.

~Hero~
Powers - Super strength, Being REALLY stealthy, and Flight.
Colors - Primary, Secondary
Gadgets - Cybernetic arms and legs (provide strength and flight), and laser from palms because why tf not.
Outfit - Basically the same as the normal outfit.

~Villan~
Powers - On command, Right eye and red hair streak glow intense red and both arms morph into a demon-like form granting immense strength, and telekinesis.
Colors - Same as Hero.
Gadgets - A hellish shard of rock that he can change into any type of melee weapon. Sword, Axe, Hammer, Scythe, you name it.
Outfit - Long coat and leather gloves (Black base color with red trim on both).

Damn this post is long. But hey, it was neat coming up with this.