A flame of fire (φλοξ πυρος). As in the opening vision of Christ in Revelation 1:14 (Revelation 2:18).

Many diadems (διαδηματα πολλα). A new feature, but the dragon has a diadem on each of his seven heads (Revelation 12:3) and the first beast one upon each of his ten horns (Revelation 13:1). So the victorious Messiah will wear many royal diadems and not mere crowns, because he is King of kings (Revelation 19:16).

And he hath (κα εχων). Nominative active present participle of εχω either used absolutely as an independent verb (like indicative) or in an anacoluthon, though αυτου (his) is genitive.

A name written (ονομα γεγραμμενον). Perfect passive participle of γραφω as in Revelation 2:17 (cf. Revelation 3:12).

But he himself (ε μη αυτος). "Except himself" (common ellipsis of the verb after ε μη, "if not"). See Revelation 2:17; Revelation 3:12 for the new name there described. See Revelation 14:1 for the name of Christ on the forehead of the 144,000, and Revelation 17:5 for the name on the forehead of the harlot. This word here supplements what Jesus says in Matthew 11:27.