User blog comment:CoolJazzman/Stern Ritter count/@comment-5147109-20130627180839/@comment-11051098-20130629231045

Kirge might have had a letter because of his "signature (?)" attack, the jail that he trapped Ichigo in And I suppose Yhwach has the letter A just because he's the first and original Quincy.

But except for Yhwach himself, there's so far only 1 other who has a letter, who's not (officially at least) a Stern Ritter.