Just in case you don't know what some of them are ^ _ ^
Administrator- People who help created this site.
Weapons- Fighting objects that Meisters use to fight
Meisters- People who wield the "weapons"
Teachers- People who teach students at Shibusen to be a good "meister" or "weapon"
Infinites- Delinquents of Shibusen
Demon Blades- souls on the brink of becoming a Kishin
Moderators- People who monitor the site
Death Scythe- weapons that have collected 99 pre-kishin souls and 1 witch soul