She calls herself the strongest of the Malebranche.
Rubina has vast power and can summon endless shadow soldiers to fight for her.
While not showing much emotion, Rubina truly enjoy fighting strong opponent and the thought of chance to fight with the other Trinity Seven, such as Levi who managed to injure her, excites her.
Road of Nightmare - Rubina summons a hollow grim reaper which she controls using threads connected to her fingers. She is capable of summoning many of them to take down stronger enemies as well.