He said himself that the form he take does not exert any special meaning or reason.
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In the anime "Hellsing Ultimate," Alucard transforms into a girl in one of the episodes due to his ability to shapeshift. The transformation serves as a way to showcase his immense power and unpredictability as a vampire. It also adds a unique and unexpected element to the character's already complex persona.
It may be Walter's mother he may have turned into, or an old loved one. Either way, it's Alucard's way of playing mind games.