1) Controversialist 2) Disputant 3) Eristic 
• (a.) Accusatory.
Ac·cu`sa·to'ri·al adjective Accusatory. 
[adj] - specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor
adjective specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor
of, like, or pertaining to an accuser.