Yep, which is why I put that note at the foot of the list. I'll keep an eye out for new suggestions and will update as needed. One way you can check to see if the list is fairly current is the "last edited" date at the bottom of the post.
I noticed Alicia Vikander is listed as suggested to play Luthien, but she's already cast as Gilraen, right? (I'm already beginning to forget the first season...)
Haakon, you're right - Vikander is indeed already cast as Gilraen. I'm incredibly fuzzy on season 1 too but I do remember that particular casting. I'm not really sure what happened there, sorry! I've since fixed it and, for good measure, double-checked the season 1 list; I don't think there are any more repeats but let me know if you run across one.