- Kingsley was born in Barnet, London, England. His mother, the daughter of Trinidadian immigrants, converted to Judaism. His mother, along with Kingsley and his brother, took on the name "Ben-Adir." The words ben adir are Hebrew, meaning "son of the strong or mighty.".
- Trained at the Guildhall School of Music and Drama, graduated in 2011.
- Grandfather was an extra in the remake of Little Shop of Horrors (1986).
- Father is a musician and mother a caregiver.
- Attended William Ellis School in Gospel Oak, Northwest London.
- Graduated from the Guildhall School of Music & Drama in 2011.
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