While it wouldn't be needed it wouldn't hurt to try to put some emotion or whatever to the role. Tho as long as your mic quality isn't crappy, I can understand and hear you purfectly you have an English accent and at the very least you don't sound like depressed mopey teenager doing a moumbly voice (or something like that idk if that's the best way to describe it TBH) then use what ever voice you like, you can just use your normal voice with no changed emotion /acting threw the entire thing