- For his part in Lion (2016), he had to develop a new physique and attended several hours in the gym in order inhabit his part. He also grew a beard and developed an Australian accent. In total, he spent eight months preparing for the role.
- Received an A* for GCSE drama, after moving his examiner to tears with a performance of a child in the Beslan school siege.
- He's skilled in martial arts and has a black belt in tae kwan do.
- Studied at Longfield Middle School & Whitmore High School in Harrow.
- Dev has a sister who is four years older than him.
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