User blog comment:GoDai/GoDai's Translations: People and Groups (3) - All about Positions/@comment-4076672-20120630194713/@comment-1926430-20120630220803

Well. The truth is, on the earlier floors of the Tower, positions don't seem to take as much effect yet. Later, on higher floors, battles are almost always in teams so positions become more important. For example, most of the regulars didn't even have decided positions until after the crown game. Also, clearly in the trustworthy room test positions don't matter too much.

I would also think Yeon is a Fisherman if she can take on the role at 20F, unless she's a prodigy and already mastered two positions. She might be keeping her invenotry in invisible mode all the time, as she seems to prefer attacking her opponents with fire.

About the blaze user thing, it's too early to list her I think. The theory could be wrong, and blaze users may have nothing to do with making fire.