So let's get this straight.

We have 2 people claiming cop - Ken and Mitsuru. Only one of these can be telling the truth.
We have 2 people claiming doc - Koromaru and Aigis. Only one of these can be telling the truth.
We have 3 people claiming vanilla - me, Akihiko and Elizabeth. Only two of these can be telling the truth, of which I am one.

That's everyone in this game involved in a conflict besides Junpei who alone claimed Tracker. Wonderful.