He's pretty popular in Japan and some fans adress as him as the next Son Goku. Some of you might already know him.
After watching a couple of his vid i am convinced he would be an excellent cast for both Goku and Goten if the day would eventually come they can no longer be done by Nozawa.
Identity Tajima is the name.
Tajima decided to impersonate Nozawa Masako, using the voice of Goku, as though this was the way Nozawa spent her daily life. This allows for the comedy, and it works by creating ridiculous real life situations.
Tajima started this act on a YouTube channel with his comedic partner 見浦 (Miura), and the 2 of them combined make up the group “Identity”. They started a fun back and forth of Miura and “Nozawa Masako.”
In this video he performs Goku and Goten:
https://www.youtube.com/watch?v=tkcDUSKwYtQ
His imitation is compared with recordings of the real Nozawa doing the characters and the resemblence is striking.

The difference between the voices is actually very difficult to hear.

I have come on some Goku-imitators on the internet, but this is the best one i found so far. I found no information on Kanzenshuu on him yet. That's why i thought i'd share his 'performance' with you guys.