Bleach - Thousand-Year Blood War - Episode 12 - Isshin Fire Getsuga Tenshou

You can tell that Isshin is Ichigo's father. He has the Shiba clan's fire and uses Getsuga Tenshou.

Urahara connected with Isshin and Ryuuken after Masaki showed symptoms of hollowfication. The Black Hollow, which Aizen called White, injected its Hollow essence into a Quincy. The only way to save Masaki's life was to connect a shinigami-human hybrid's soul with hers. Isshin immediately agreed. They eventually fell in love, had children, and Isshin made Masaki his Sun.

The Kurosaki family's happy life changed when Yhwach, the Father of the Quincies, took back his power from the unworthy. That included Ishida's mother, Katagiri, and Ichigo's mother, Masaki. The Fisher King Hollow should never have been able to defeat a Quincy princess like Masaki. But the coincidental timing of losing her powers sealed Masaki's fate. After her death, Isshin regained his shinigami powers, and Ichigo met Rukia. The rest is Bleach history. Ichigo knows where he came from, who he is, and who he must fight. He's ready to claim his zanpakuto.

The end card shows Isshin living his best life. Rescuing naked Quincy princesses should be the goal for every shinigami captain.