This is only a sample but I think ‘Ace0fClubs0001’ and ‘PantoneSalmon’ did a great job! I totally would believe that they are the official voice actors. Check it out for yourself.
“Fandub edited and mixed by yours truly. This one took quite a bit of work and I was really anal to get the sfx to near perfect. Shoutout to PantoneSalmon for doing an amazing rendition of Saitama!” – Ace0fClubs0001