The only costumes I've seen at Sakuracon have been one or two Seras's, a handful of Alucard and a few Integra's and Shroedingers, and at SC2011, I didn't see any Hellsing characters but one Alucard =/ I'm hoping next year since I'll be going as Seras
that there will be a few more out there.
In War, Victory.
In Peace, Vigilance.
In Death, Sacrifice.
They Will See... We'll Fight Until Eternity...
Come With Me, We'll Stand And Fight...
Through Our Strength We'll Make A Better Day Tomorrow...
We Shall Never Surrender.
Sakuracon '12~ Victoria Seras (Blood Version)= Hellsing