  There are four general accounts of personal identity that have been taken to have some relevance to ethics by contemporary theorists: psychological, biological, narrative, and a new one to be labeled “anthropological.” After discussing these four, as well as a fifth view that identity doesn't matter for ethics, we will evaluate the views in light of a challenging thought experiment: fission. After that, we will discuss the relevance of both souls and a four-dimensionalist ontology to the issues at hand.