I think you could go with two main characters, but in a perhaps strange way:
Main Characters
1. Morgoth.
2. Fëanor; and once he dies, his seven sons as continuations of him, since his oath binds them, and all their deeds flow therefrom.
Minor Characters
- Thingol
- Beren & Lúthien
- Finrod Felagund
- Túrin
I guess that's five, if you count Beren & Luthien as separate characters.
Earendil's role was crucial, but somehow it lacks the depth and scope that these other five exhibit in the Sil.
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