Some of the causes of other-/fictionkinity I've seen:
Archetypes
Dissociation
Dual souls
Energetic resonance
Extended minds
Genetics
Imprinting
Link-turned-kintype
Magic
Mental illness
Mind-altering substances
Neurology
Nonhuman ancestry
Out-of-body experiences
Possession
Psychic connections
Primal links
Quantum mysticism
Reincarnation
Shards
Social contagion
Soul in the wrong shape
Spirit animals
Split souls
Subconscious coping mechanism
Unlocking the nonhuman instincts that everyone has



















