Groups....

Bount: the Bounts are a clan of human beings with high spiritual energy and special powers. They were accidentally created by Soul Reaper scientists looking for a way to create eternal life. Bounts consume the souls of human beings to survive; theoretically, a Bount could live forever by doing so. Although the Bounts have a strict rule to consume only the souls of the dead, the final group of Bounts chose to drain souls from living humans in order to become more powerful. Each Bount uses a "doll" in combat, a type of familiar possessing its own special abilities. Every doll is unique and is a manifestation of the user's power. If the doll is destroyed, its owner is destroyed as well

Soul Reaper: Soul Reapers, or shinigami as they are called in Japanese-language releases, are the psychopomps of Bleach. They are souls with inner spiritual power, recruited from the ranks of the residents and nobility of Soul Society. Like all spirits, they cannot be detected by normal humans. Soul Reapers use their zanpakutō, supernatural swords that are the manifestation of their owners' power, to perform soul burials on wholes.[4] Soul Reapers also use zanpakutō and magic known as kidō to fight their archrivals, the hollows.[4] A group of Soul Reapers known as the Visoreds have obtained hollow powers, gaining removable masks and access to certain hollow abilities.

Quincy: The Quincy are a clan of spiritually aware humans who once fought against the hollows, using bows composed of spiritual energy to slay them.[8] As opposed to Soul Reapers, Quincy absorb and channel energy from their surroundings to fight.[9] Unlike the Soul Reaper's method of killing hollows which allows the hollow to enter Soul Society, the Quincy technique simply destroys the hollow's soul entirely.[8] This method has the propensity to shatter the balance of the universe, because when souls are destroyed, the number of souls entering and leaving Soul Society cannot remain equal