Aspected Kin
Sometimes otherkin who are singletons are aspected along the lines of their otherkinness.
For example if an otherkin has past lives as an elf, a dragon and a vampire, they might shift between these various aspects but still retain their singular sense of "self," direction, purpose and memories. However, they can look at a single situation from all three perspectives: the perspective of an elf, of a dragon or a vampire, and apply the different philosophical perspectives to the situation while retaining the sense that they are still only one person in control of their single life.