Frodo (and Bilbo)
This is quite strange, I thought.
In the anamated Ralph Bakshi version of Lord of the Rings, the voice of Frodo is performed by Christopher Guard, who plays Marius in this version of Les Mis.
Also in this version of Les Mis is Ian Holm (playing Theanrdier) who also did the voice of Frodo for the audiobook dramatized version of Lord of the Rings. Now Ian Holm has played Bilbo Baggins in Peter Jacksons Movie Trilogy of Lord of the Rings.
"Hating people is like burning down your own house to get rid of a rat". ~Henry Emerson Fosdick