Kamina was the original deputy soul reaper before Ichigo Kurosaki was. Kamina himself volunteered to be the first Royal because his family disgraced him for being a soul reaper.
Zanpakuto:Edit(Kakiame 'Fire Rain')
Kakiame has the ability to burst out fire at a single slash of the sword. It can also throw a ball of fire into the air and make it rain fire. Kakiame can also put out fire by absorbing it.
(Kakiame Hou-ou 'Fire Rain Pheonix')
It transforms into a pheonix made up of flames and can be controlled by Kamina's body movement.