By popular demand, the identities of these people . . .
Male Integra: Sephiroth, from a Final Fantasy doujinshi by Hirano-san
Female Walter: Maggie, from Read or Die
Male Seras: Schrödinger, from Hellsing
Female Pip: Elle Driver from Kill Bill
Female Alucard: Alucard, from Hellsing: The Dawn

Email: How would the characters of Hellsing look if they were all the opposite gender?

Erin: Friend, you’re in luck. Shine has gotten ahold of exclusive pictures of exactly what you want to see. Most of them are even drawn by Hirano-san himself!