We don't know yet, there hasn't been a backstory yet but that will come sometime. ; ]
I'm pretty sure that he was a Captain at one time before meeting Ichigos mother.
As of currently, Isshin Kurosaki, father of Ichigo, Karin and Yuzu Kurosaki, is alive and well.
Ichigo's father is the Soul Reaper Isshin Kurosaki.
Ichigo Kurosaki is the main character in the Japanese animated cartoon and comic book, Bleach. Characters in Bleach that are also in his bloodline include Isshin, Karin, and Yuzu.
As Bleach is a Shounen (boys) manga, and not a Shojo (girls) manga, we can assume that there will be no romance in the series
Ichigo sees his father as a Soul Reaper in the anime Bleach episode 32 titled "Stars and the Stray." In this episode, Ichigo's father, Isshin Kurosaki, reveals his true identity as a former Soul Reaper captain.
If you are speaking about role, he is a Shinigami.
Kurosaki
Ichigo's dad, Isshin Kurosaki, reveals the truth about Ichigo's mother, Masaki Kurosaki, during the "Soul Society" arc of the "Bleach" series. This revelation occurs when Ichigo confronts the reality of his family's ties to the Soul Reapers and the significance of his mother's death. Isshin explains Masaki's background and her connection to the Soul Society, deepening Ichigo's understanding of his own powers and heritage. This moment is crucial for Ichigo's character development and his journey as a Soul Reaper.
Ichigo Kurosaki from Bleach .
Ichigo kurosaki rukia kuchiki orihime inoue uryu ishida chad byakuya kuchiki renji abarai yamamoto gyuunsai toshiro hitsugaya rangiku matsumoto momo hinamori aizen sousuke kenpatchi zaraki yachiru kusajhi kira izuru gin ichimaru isshin kurosaki masaki kurosaki karin kurosaki yuzu kurosaki kon chappy grimmjow jeagerjagues neliel tu observank ulquoirra schiffer apporo grantz kaien shiba kukaku shiba ganju shiba yoruichi shihouin soi foon kisuke uruhara
ichigo said in bleach episode 309 "the final getsuga tenshou is me" Isshin can also use this form of getsuga but it will be slightly different, just as the names for the 2 zanpaktou differ too. Isshins final getsuga will be called !!spioler!! Zangetsu, its heredatary