Lex

Lex (レックス, Rekkusu) (real name Hektar Rost) is brain and "leader" of Black Ace mercenary duo. He is know to be violent and bloodthirsty killer in underworld. Lex has also reveal that he is part of darktera race and his species is otter.

Appearance
In his human form, Lex looks like teenage boy with mohawk similar to that of the circular saws blade and stitched scar above his nose that stretches across his face.

He wears checkered scarf, long sleeved shirt with logo of apple half and frilled shirt hem and sleeves, trousers and pair of sandals. Like al darkteras, he wears sunglasses.

Sword
Lex firstly used sword similar to that of Kampilan, but after its blade was destroyd he started to use rapier, which gained after he stole it from an unknown guard, whom he killed.