I'm helping out in Sonic Forces 2 by casting. All you need to do is to remix and record your voice saying the lines. You can audition for as many characters as you want, but you'll probably get only one or two roles.
Since this is for a game CrAzYGaMeR8346 is making, I'll be really strict on who gets in. You'll have to sound really close. Don't want to voice act? You can still help out! Just go to the studio. BTW, none of this is cannon and the roles may not be accurate, since I don't know any of the roles.
