I have a very good amount of experience with voice acting as well as acting in general and I'd be more than happy to lend a hand with ANY voice you may need. My regular voice is fairly low but I can alter it lower, higher, etc.
I have a very eerie / raspy voice I can also do as well as a low "Megatron" voice.
I can do a dramatic character, a leader-type character, and I can have a little bit of fun with any Covenant character. If you still need help please let me know! I already have a microphone and recording software as well.