To facilitate our online discussions, a private mailing list was created, known of and subscribeable to only by personally known otaku tomodachi. We have never been a public entity, nor an organized club. Over the years, as friends introduced friends to friends, our little fan network grew, as did our ML.
Members of Sempai (as our ML was named and as we came to refer to ourselves) are involved in all areas of otakudom. Members have worked staff at cons, are officers or department heads of cons or even started cons! Others of us fansub either animated or live action japanese shows. Some of us have written fanfiction or other fiction. Many of us are computerly geekish, and are involved in online otakudom in many ways.
Sempai is not a structured group. We are a bunch of friends who created this forum to improve and facilitate communication with other members, as a sort of private network within fandom, and to enjoy the fellowship of other intelligent people who enjoy the same hobbies.