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Here are my thoughts:
1. Phagocyte checks Cash.
2. Antibiotic monitors Arandor.
3. Leukocyte protects Cash.
4. Granulocyte protects Amko.
5. Monocyte protects Tako.
6. Lymphocyte blocks Cash's special ability.
7. Alcohol blocks Lizard's special ability.
8. Hepatitis checks Lizard.
9. Flu kills Tako.
10. Thrombocyte revives Neyra.
Check the hints to see who among Cholera, Opium, and Heroin killed Cash.
There's no other murder, so either a block is working, or the murderer was killed and healed (Tako). I'm not accusing anyone specifically, just thinking out loud.
By the way, NNV, or HIV will steal the voice too)).