They've all been done in a good way. All the greats in the myth. One was there from the beginning and I finally wish to see him on the big screen. Name of Robin. Red and Green are his colours. Bruce could use someone to talk to besides Gordon, Alfred and Selina.
From all the Robins I'd choose...
Dick Grayson, the original sidekick, orphan, taken in, training starts at the age of 12, maybe 14.