The soul of a dead Human normally passes on to the Soul Society with the assistance of a Shinigami. However, Humans that lived lives full of sin - including those that become Hollows after dying - are incapable of entering the Soul Society. Instead, they are cast into the depths of Hell, where they are bound by indestructible chains and condemned for the rest of eternity. Under ordinary circumstances, these Togabito are incapable of leaving their prison, for they are constantly watched over by Kushanāda, the guardians of Hell. However, some Togabito are capable of leaving Hell and entering the Human World, though they apparently need to conceal their faces to prevent Kushanāda from dragging them back into Hell. Some Togabito possess immense amounts of power, which can surpass even that of an Espada.
Whilst in Hell, the Togabito live through a constant cycle of rebirth, death and regeneration. After a being is killed in Hell, their bodies are enveloped in chains, which sparks the transition into a Togabito, ultimately trapping them there, due to the sturdiness of their chains.  Also, the strength of each particular Togabito is the primary factor which influences their rate of regeneration. For example, when Taikon, Gunjō and Garogai were killed by their respective opponents, they were revived only moments later by Shuren at the lava pit on the fourth level of Hell. A more notable example would be when Kokutō revived himself mere moments after his act of self-sacrifice to kill Gunjō, which reflects his sheer strength as a Togabito.