Lord Tamamo

Lord Tamamo (玉藻) is the successor to the Kyuubi who is the mastermind behind the sesshōseki-related incidents that have occurred and Kazuhiro Mitogawa's overlord.

Personality
Lord Tamamo doesn't seem to have a discernible personality who appears quite inhuman.

Background
Lord Tamamo used to be a demon-user who became an evil spirit of incredible power after death.

Plot
Lord Tamamo is first identified in Chapter 19 when Kazuhiro removes Kagura Tsuchimiya and Kensuke Nimura's souls and takes them to Tamamo Garden. When Kagura attacks him, Tamamo intervenes and reveals herself. Tamamo tells them to fight and search for the ten sesshōseki, and that the one who collects them all will control the Kyuubi, and be its true successor.

Etymology

 * The name Tamamo means "ball, sphere, bullet" (玉) (tama) and "algae/alga, seaweed, duckweed" (藻) (mo).