Roberto is an elderly man at the House of the Old whom Jonas had once helped feed. When Jonas goes again to the House of the Old and meets Larissa, she tells him that Roberto had been released earlier that day in a wonderful celebration. During his release, his life as an Instructor of Elevens, a member of the Planning Committee, and a father of two successful children had been celebrated. Before he was placed in the House of The Old, he designed the landscape for the town hall (of course, he didn't do the actual building).
He was not mentioned in the movie.