Someone who consistently blames others for their own actions is often referred to as a "blamer," "finger-pointer," or "fault-finder." They may have a tendency to avoid taking responsibility for their mistakes or shortcomings and instead shift the blame onto others.
This behavior is generally considered to be unhealthy and unproductive in interpersonal relationships, as it hinders personal growth and problem-solving. Taking responsibility for one's actions and learning from mistakes is an essential aspect of emotional maturity and self-awareness.