Saber is Shirou Emiya's heroic servant during the 4th Holy Grail War and is the Saber Class servant. She is in actuality, King Arthur. Her personality is very serious, loyal, independent, and a little reserved. In comedy spinoffs she can occasionally be shy and cutesy. Saber is very strong and is often underpowered by Shirou's lack of mana, which leads to complicated relationship.

In Carnival Phantasm, Saber's personality is still very serious, but her over-seriousness is often played for laughs, as she's inadvertently being funny. She also shows a cuter, softer side in Carnival Phantasm, especially if it involves Shirou and making her food.

I see two approaches for Saber’s voice. One, a medium low to medium voice similar to Kari Wahlgren’s version. Two, a medium high tone like the Japanese VA with a hint of cute in it. Or, your own approach could work too! Note, I’ll also have this VA voice Saber Alter (her alternate dark version) and Saber Lion in the brief skits they appear in.