>>530731592
More voice languages have been a thing since Generations, after disc storage space became less of an issue. In addition to Japanese and English, there's French, Spanish, Italian and German (sometimes more are available as subtitles).
Warning: Spanish Sonic is WIND-SEXO

>>529659556
>>529660354
To be completely fair, they seem to have canonized Frontiers' EN direction for Knuckles' character instead of the JP one.
inb4 Ian said they weren't mutually exclusive