Rei is the leader of the Seven Sages. But this title seems to be meaningless, as she is teased on a near daily basis by the other six members of the Sages and sent to do pitiful work.

She also has a counterpart present in the Hyperdimension, doing civic actions.

Rei seems to be the very sensitive, gentle type of character who somehow manages to handle being bullied, teased, and harassed on a daily basis very well. She tries to keep things in order, but she seems to be very pathetic, according to others. She has a lot of trouble speaking decently in front of people and lacks any actual powers. She has barely any confidence, possibly none at all, and is always fearful.

(Source: Wikipedia)