That's cool. Though, if you wish to be professionally cast, any seiyuu will tell you that you should imitate actual Japanese people like in dramas and movies. Anime pitches are based off archetypes, which are good to have, but the best voice and the one that many agencies and producers look for is a natural voice.

I'm practicing this using a method of imitating anime characters I like or am able to reach their pitches, I recommend it.
We can help each other if you want :)
email me : [email protected]

Really? That's cool! Who inspired you if anyone?