Bosco was a boy. Still is. He is currently doing the after-dinner circuit.
The ultimate proof of this is that the word is a Cavan saying, greeting one another with "All right Bosco?". This is exclusively said by men to other men.
Also, John Millington Synge wrote two acts of a play called 'The Rambler the Red-Haired Bosco', which was closed after just three performances after the audiences' reactions to the lying, lip-licking schemer that was the character of the Red-Haired Bosco. The character had a "wheedling high pitched voice as would part the moss from a stone" and was a male peasant farmer.
Richard Deeds, the RTE props designer credited with creating Bosco has referred to this character as inspiration for the ideas he submitted for RTE's new children's show.