Fair warning: the above video does show some footage from God of War Ragnarok that may be considered spoilers. That said, it's worth a watch if you're a fan of the series. It's the latest dev diary about the game, this time honing in on Kratos himself.
Christopher Judge, who provides the performance capture and English voice work, talks about the role with a clear passion. He discusses how much the character has evolved, and how he's able to draw from his own parental experiences to portray the stoic Spartan. We also hear from some Santa Monica Studio staff and the stunt actor for Kratos, who brings up the physicality of his combat style.
What's best about the video, though, is we get to see a few of the other voice actors who play Kratos in other languages. Ricardo Juarez, Hesham El Shazly, and Kenta Miyake voice the character in Brazilian Portuguese, Arabic, and Japanese respectively. We don't often get to hear from actors playing the same part in different regions, so it's quite refreshing to get their perspectives on the character.