Morgoth’s RingJ.R.R. TolkienThe History of Middle-earth Series, book 10

Characters in Morgoth’s Ring

2 characters, main characters first.

Antagonists

Morgoth
The focus of this volume's theological exploration -- Tolkien reworks the nature of the first Dark Lord, arguing that he dispersed his essence into the matter of Arda itself.
Also in The Book of Lost Tales, The Lays of Beleriand, The Shaping of Middle-earth, The War of the Jewels

Supporting characters

Manwe
The lord of the Valar appears in revised and expanded forms in the Later Quenta Silmarillion sections of this volume.