The Dior Dilemma

[The Might]

Well, I've looked through the thread and noticed nobody gave any quotes on this so I will:

"Eärendil is Túor's son & father of Elros (First King of Númenor) and Elrond, their mother being Elwing daughter of Dior, son of Beren and Lúthien: so the problem of the Half-elven becomes united in one line. The view is that the Half-elven have a power of (irrevocable) choice, which may be delayed but not permanently, which kin's fate they will share. "
(Letter #153)

' Dior their son, it is said, spoke both tongues: his father's, and his mother's, the Sindarin of Doriath. For he said: 'I am the first of the Peredil
(Half-elven), but I am also the heir of King Elwe, the Eluchil.' (HOME XII)

"Now fare the long days of Elfinesse unto that time when Tuor
dwelt in Gondolin; and children then had Dior the Elf," (The Book of the Lost Tales II)

'Dior the Elf' is an emendation from 'Dior then an aged Elf'. (The Book of the Lost Tales II)

Well, as seen above in the first writings on this topic Tolkien considered him an Elf clearly.
In later writings this becomes unclear. The quote from Letter #153 shows that Dior was given this choice. The question remaining is which choice did he make.

Considering what we know about him, I personally see him as an Elf. We know he was named "Thingol's Heir", and he was King of Doriath. I doubt the Elves would have accepted a Man as their ruler, even if he was the rightful heir to the throne. Also, there is one other example of a Half-Elf that rules over Elves - Elrond - and it is well known which choice he made.