anti virus aka avi
she was made using virus's dna in order to find a cure for those who have touched/absorbed his blood.
though classifide as brother and sister virus would be more like a biological father since his dna and only his created her anti viru's blood can cure any illness except stupidity and mental diseases.
she is a goody two shoes and does not require fresh dna in order to live. she is basically a typical blond except shes a brunet/black head.