Kai

Bankai revealed: Nozarashi (Bankai). Kenpachi's Bankai is implied but not fully revealed in the anime's current run.

Bankai revealed: Unnamed. Ukitake's Bankai is never shown in the anime.

Bankai revealed: Katen Kyōkotsu: Karamatsu Shinjū. A dark-themed Bankai that forces both wielder and opponent into a tragic 'play' with scripted death scenes, used against Lille Barro.

Bankai revealed: Wabisuke (Bankai not shown). Kira's Bankai is never revealed in canon.

Bankai revealed: Fushi no Kōji. A Bankai manifested through a conductor-like entity, implied but debuted only in Can't Fear Your Own World novel and partial TYBW scenes.

Kaien Shiba, killed by Rukia Kuchiki (mercy). Rukia delivers the killing blow to free him from Metastacia's possession

Miyako Shiba, killed by Metastacia. Devoured by Metastacia

Metastacia, killed by Rukia Kuchiki. Purified by Kaien's final attack

Renji vs. Byakuya (Bankai duel). Byakuya wins

Reveals Bankai Hihiō Zabimaru on the Sōkyoku bridge

Ichigo tames his inner Hollow for the first time during Bankai training with Urahara and Yoruichi.

Ichigo vs. Byakuya (Bankai duel). Ichigo wins

Achieves Bankai (Tensa Zangetsu) during rescue operation

Kariya Jin, killed by Ichigo Kurosaki. Defeated by Ichigo Kurosaki after consuming Jōkaishō

Resurrección released: Glotonería. Reveals the stolen form of Kaien Shiba to destroy Rukia's spirit before releasing into a massive tentacle beast.

Aaroniero Arruruerie, killed by Rukia Kuchiki. Cut down by Rukia after revealing himself behind Kaien's face

Baraggan Louisenbairn, killed by Self (Hachi's trap). Aged to dust by his own Respira ability after Suì-Fēng's Bankai fails to destroy him

Bankai revealed: Tekken Tachikaze. A Bankai manifesting as oversized knuckle-like gauntlets, used against Wonderweiss Margela.

Chōjirō Sasakibe, killed by Driscoll Berci. Defeated and killed by Driscoll Berci during the first Wandenreich invasion

Byakuya vs. Äs Nödt. Äs Nödt wins (Byakuya gravely wounded, Bankai stolen)

Yhwach (actually Royd Lloyd) steals Bankai from multiple captains including Hitsugaya, Suì-Fēng and Kyōraku.

Mask De Masculine, killed by Rōjūrō "Rose" Ōtoribashi. Defeated by Rōjūrō Ōtoribashi's Bankai Kinshara Butōdan

Rose vs. Mask De Masculine. Rose wins (Bankai Kinshara Butōdan)

Mayuri vs. Pernida Parnkgjas. Mayuri wins via experimentation and Bankai

Bankai revealed: Kannonbiraki Benihime Aratame. Cornered inside Askin's Gift Ball Deluxe, Urahara activates his Bankai for the first time in front of anyone in Wahrwelt. It restructures whatever it touches, restoring his destroyed eyes and reworking his own body mid-fight.

Urahara and Grimmjow vs Askin Nakk Le Vaar. Urahara's Bankai keeps him alive long enough for Grimmjow to crush Askin's heart, but the dying Gift Ball intensifies around them

The Visored vs Gerard Valkyrie. Eight Visored land their combined Shikai, Bankai, and Cero barrage; Gerard walks out unscathed and levels all of them with one lariat

Bankai revealed: Unnamed. Nozarashi, appearing to Kenpachi as Yachiru, hands him the power of Bankai against Gerard Valkyrie. His skin turns red and he grows horns, ripping Gerard's arm off with his teeth before the strain breaks his own right arm.

Kenpachi, Byakuya, and Hitsugaya vs Gerard Valkyrie. Kenpachi's Bankai bisects Gerard and Byakuya's Ikka Senjinka shatters his frozen body, but The Miracle rebuilds him larger each time

Ichigo and Rukia vs Yhwach. Yhwach runs both through and stands on Ichigo's head; Ichigo's Bankai turns it around until Orihime flies into Yhwach herself and the chamber fills with red petals