Dark Souls: Knight Artorias

Dark Souls 2: Sir Alonne

Bloodborne: Ludwig, the Accursed/the Holy Blade

Dark Souls 3: Slave Knight Gael

Sekiro: Owl (Father)

DeS - Maiden Astrea

Ds1 - Artorias

Ds2 - Alonne

BB - Ludwig

Ds3 - Gael

Elden Ring - Glaive Master Hodir

And the award for the most generic answers goes to...

DES. Dragon god.

DS1. Cannot decide between the DLC bosses because all of them are so great!

DS2. Fume knight.

DS3. Midir.

Bloodborne. Lady Maria.