Mental-Doppelgänger

Two people who do not look alike but are the same person.

Mental-doppelgängers share extremely long list of things in common, including weirdly random things and being able to finish each other’s sentences perfectly

Mental doppelgänger

When to people don’t share similar physical traits but instead share a similar train of thought and emotions therefore thinking alike

Her and her sister are mental doppelgängers because the think alike a lot.