From the wiki: If your will consists of only transporting one person with yourself, or dead people, you may be suspected as a Hypnotist.
Found Hatter's will myself:
N1: Himself with MMFELX (MMFLEX died N1)
N2: Himself with Rayzor (Rayzor is killed by the mafia that night)
N3: Himself with omg (Omg is suspicious of hatter, dies to the mafia the next night)
N4: Hatter is jailed
N5: Himself with solas
There has not been a single night where Hatter transported 2 people, and most of his targets died the same day.