Xarbeef is basically just Xabat, but the Sunky version. He still kills his victims, but they're totally fine with dying because it comes with some cool benefits like extra tails or being cooler in the summer (aka being a skeleton).

Xarbeef's voice is just a knockoff Spongebob voice i'm gonna be real with you

This is basically a chromatic scale only voice (besides the laugh), but you will still be the official voice of Xarbeef if you are accepted.