Mei's normal speaking voice is almost identical to Rika Furude's cutesy voice and to Sakura Yoshino. In a twist of fate, Rika's adult voice sounds like Mai Kawasumi, who is from another Key game (Kanon).
Newbie Boom: The anime coming out created one, just like with the other two Seasonverse works, but for one reason or another, even though AIR and both versions of Kanon were also simulsubbed, CLANNAD got a lot of fans. For the first time ever, Key fandom had an offshoot — an independent CLANNAD fandom that hadn't even heard of the other works and didn't feel obligated to check them out. (This happened again with Angel Beats! a few years later.)