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The player creates their own Avatar whose default name is Robin (ルフレ, Reflet in the Japanese version). They are also able to build supports with all characters in the game, allowing them to support all playable characters. Males can be a Mercenary, Fighter, or Knight, while females can be a Pegasus Knight or a Myrmidon. The Avatar's starting class is up to the player themselves from the beginning, though the classes available is dependent on the Avatar's gender. These changes become permanent until the player's next customize option is given. At the end of certain chapters, the Avatar will have a choice to adopt a new hairstyle, gain a new headwear, or even a mask. The Avatar's starting class determines the kind of clothing their conversation sprite will wear, but like everyone else can be reclassed at any time. Players also choose what kind of past, present, and future their Avatar has to determine their stat growths. (They were not originally present in Mystery of the Emblem.) The player can customize their Avatar with numerous faces, hair styles, and hair colors. The Avatar is the protagonist during the prologue and the deuteragonist for the rest of the game. The player creates their own Avatar whose default name is Kris (クリス, Chris in the Japanese version) and is the first playable combat Avatar unit. Florina will stutter if Mark is male but speaks normally to a female one while Sain flirts with a Female Tactician but speaks normally to a Male Tactician. Some dialogue between them and other characters change as well. While they do not have a standalone sprite nor do they have speaking dialogue, Lyndis, Eliwood, and Hector constantly "speak" to Mark and have special conversation sprites whenever they do, looking directly at the player. At the end of both Eliwood and Hector's stories, they eventually depart from Lycia to travel the world, but they are named the godparent of their respective children, Roy and Lilina, and are the ones who gave them their names.
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Later, Mark helps Eliwood and Hector in their stories. After nursing them back to health, Mark aids Lyndis in her journey to defeat Lundgren and rescue her grandfather. Mark is a wandering traveler who is found on the wayside by Lyndis. Mark is completely unseen except for the two CG images in Lyndis's story, where the in the former, they can barely be seen on the bottom-right border, while in the latter, they can be seen next to the right border. The more Tactician Stars the player obtains, the more Critical Avoid is given to all units in the player's army. Additionally, as the player progress through the game, they earn Tactician Stars. Mark does provide certain benefits in during gameplay, as the player can determine Mark's affinity through their selection of birth month and, in the Japanese version only, blood type, boosting the hit rates and avoid for units of the same affinity. While Mark does not enter battle, they are designed to be the main strategist for the events of battle throughout the entire story of The Blazing Blade. While no true Avatar character exists like in the games that succeeded it, the player creates their own character who is a tactician, whose default name is Mark ( マーク).
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