This occurs when a character's sibling dies and the character absorbs their soul, or the dead may force their Life Energy on to their sibling. The rule of "two souls cannot control a body at the same time" usually applies and the siblings will switch control over the body. The original owner of the body is usually in charge, but the dead sibling will take control at key moments. Usually accompanied by friends of the 2-souled-twin saying he/she is Not Himself. In most cases when the inhabiting sibling is in control, a distinct feature will let the audience know. This can range from Mind Control Eyes, to a colored aura that appears around the character, in some cases the voice will also change.