[Anguirel]

Dealing with only Beren and Luthien for now...I can't approach the universality of Saucie...

Luthien-Renee Zellweger, going by the earlier versions where Luthien was blonde. In fact, going by a very early lost version where Luthien was blonde and addicted to a dangerous cocktail of Ben & Jerrys and nicotine...

Thingol and Melian-Who else but Jim Broadbent and Gemma Jones-a rather undignified Maia but there we go...

Beren-Colin Firth, again rather predictably. A rather more boring and faintly rotund Beren, but essentially nice and good in a fight...

...which is lucky, because he has to compete with Daeron, played by Hugh Grant, and more dangerously still Celegorm, played by Hugh Laurie with a blonde curly wig, ably assisted by Curufin, played by Alan Rickman.

Not to mention the minor matter of getting the Silmarils from the Forces of Supreme Evil, led by Morgoth, President of the United States of Angbandia (Billy Bob Thornton), and his supremely cunning assistant Sauron, here played by that ever-popular schemer Rowan Atkinson, who has a notably camp scene in which he tries to sell a wolf pelt to Huan (Bill Nighy...)