Klaus:

Voice is similar to Ban from SDS

https://www.youtube.com/watch?v=VPVWofLdDi8

(Past)/ Corrupted Klaus:

Voice is similar to Isaac Foster

https://www.youtube.com/watch?v=-Zt0_oQNyHo

(Past)/Corrupted Klaus Laugh:

https://www.youtube.com/watch?v=QtsEFmCt0eU