So I was talking to Medic during 2nd period, we go to the same school, and out of nowhere a thought pops into me head. A manic depressive, alcoholic doctor as a NetOp. It would be great! I mean, his illnesses pretty much covers up any attempt at bad role playing through sudden personality changes. As a Navi, he should have an actual serious, no complications what so ever, medical Navi. Hence, Medicineman, a giant, walking, talking pill of a Navi.
He's able to hide in his pill casing, forming a kind of barrier, when things get rough, and he attacks with antiviral pills, which eat away at virus's programming rather than causing physical damage.