Angrod

[Haakon]

Chris Zylka
He's been in The Amazing Spider-Man and the Leftovers. I think he's got the look of someone of the House of Finarfin, and as far as casting goes, he could be the son of Dan Stevens and Holliday Grainger. His name means "iron champion" so I think Zylka being somewhat athletic works well.
http://www.imdb.com/name/nm3024712/
Age: 33
Height: 6'1"

EDIT: WAS CHOSEN; OK BY EXECS

 

[Haerangil]

Max Irons has too been suggested...

Age: 32
Height: 6' 2½" (1,89 m) (!)

https://www.imdb.com/name/nm1796057

 

[Richol Richards]

Chris Gordon.

https://www.imdb.com/name/nm5575343/?ref_=tt_cl_t8

Age: 39
Height: 6'1

A little older, admittedly, but I love his look. He's Dan Stevensesque.