I was just wondering why nobody was answering any questions on this thread anymore, when I suddenly realised it was still
my riddle.

Oops! Luckily, I remember who it was about, so:
Is it a person? - Yes.
A place? - No.
A man? - Yep.
Evil? - No.
Live in the third age? - No.
Lived in the First Age? - Yes.
Was he/she alive after the Nírnaeth Arnoediad? - Yes he was.
was it an elf? - No.
One of Feänors' sons? - See above.