What's the noun for victimiser? Here's the word you're looking for.
victim
Anyone who is harmed by another.
(original sense) A living creature which is slain and offered as human or animal sacrifice, usually in a religious rite; by extension, the transfigurated body and blood of Christ in the Eucharist.
An aggrieved or disadvantaged party in a crime (e.g. swindle.)
A person who suffers any other injury, loss, or damage as a result of a voluntary undertaking.
An unfortunate person who suffers from a disaster or other adverse circumstance.
(narratology) A character who is conquered or manipulated by a villain.