She was one of the reasons that I kept watching this bizarre anime called Seikon no Qwaser. (and the other reason was the shota named Sasha)
It can be worse in fan service than "Queen's Blade".

I don't recommend Seikon No Qwaser. I just kept watching until until the end because I though: "This is so bizarre that I want to see what the hell will happen with the plot" (plot, what plot?)

But anyway, Ekaterina is a fun character.
She just tricks you when she pretends to be a sweet girl, and then reveal her true personality and kick your ass. And Hana is her poor victim.

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