#23 is the 1st full appearance of Blackfire (Komand'r). New Teen Titans #12 #21 & #23 (DC 1981-82) Copper Age. #21 is the 1st appearance of Brother Blood (Sebastian Blood). #21 is the 1st appearance of the Monitor (Pre-Crisis).
The "New Teen Titans #12 #21 & #23 (DC 1981-82) 1st Full Blackfire 1st Brother Blood" would be best fit for fans interested in the classic New Teen Titans series and looking to add to their DC Comics collection, specifically the Brother Blood and Blackfire storylines.
