[@kishin asura]
Alucard is subject to the same limits. He is not able to absorb magic, he is not able to copy knowledge/skills. He is simply able to absorb your being.

Furthermore, Alucard is the most powerful of the Omegans. There is no way any character you are allowed to play is going to be equal with him in terms of raw power. You're going to have to beat him through teamwork and creative thinking.