Erica

Erica is a Twilight and a "hunter" that works for the Corsica Family and is also Delico's younger sister.

Personality
Utterly expressionless even while killing or fighting. Either extremely stoic or unfeeling. She keeps Mikhail on task and reminds him of their orders.

Background
Erica was employed by the Corsica Family to murder Twilights.

Abilities
Erica is a very proficient combatant, able to effortlessly overwhelm and kill most Twilights she encounters. She has gone toe-to-toe with Nicolas twice and both times matched him for most of the battle. When fighting alongside Mikhail, they are a formidable force.

Weapons
She wields a straight-edged blade that lacks a guard.

Trivia

 * It is assumed that Erica is a Twilight, although it hasn't been confirmed. Based on Dr. Theo's analysis of the massacred Twilight bodies, it was assumed their killers (Erica and Mikhail) were also Twilights and, even though Erica has no visible tags, the fact that Delico is her brother further supports the possibility of her being a Twilight.
 * Her status as a Twilight is confirmed in chapter 3 of the spin-off manga GANGSTA:CURSED.