The Ask Me board would probably be ideal, since the board generally involves users of the community approaching you with questions. Depending on whether or not you would like to add more content to your topic than simply "Ask my characters questions," such as actual info about your character, like character background, details, descriptions, and whatnot, you may be able to create your thread in the Characters board. From the sound of it, however, I would suggest the Ask Me board. c: