Make a forum where you can apply for "official" clans which are like "esport teams" in Senpa where there is a leader who can invite the people he wants to be in the clan, the clan tag is special for your specific clan and can only be displayed by you and your clan members.
For example, if Mistik would want to have his NBK separated from the rest of the Senpa community he could crate an own clan which only he could display ( only one clan per person). This would be a quite nice touch to Senpa for the many different clan communitys we have got here.