Kayden is a hunter who always seems to be wherever the protagonist are for one reason or another. He doesn't seem dangerous but he also can be a bit aggravating. He seems to be very interested in the protagonist.

He tends to speak casually presenting a very laid back manner ... even when he is 100% trying to kill you.

In a way you get a ... stereotypical care salesman vibe from him. A very dangerous one that can kill you.

The team said they don't imagine him with a deep voice. The most important thing for them is how he delivers his lines. The casual laid back attitude is what defines him the most.

Possible References: 

Please note that while we're posting references here, since these are original character, they're only an example of possible voices. Please provide us with your auditions and takes of the character even if you don't match the references.

Demyx from Kingdom Hearts: https://www.youtube.com/watch?v=4DFqX0vZMmI 

James Wood as Hades in Hercules: https://youtu.be/Bm-dPOJ7u7I?t=7s