Is there anyway I can Rosalina, Shadow, and Kid Goku thier own CCS boxes without replacing Peach, Sonic, and Luigi, and if so, how?
no, u wuld hav to hav them on those characters.
however, i do remember seeing a shadow and sonic on the same CSS. u shuld try pming ASF1nk or i think it mitve been BigSharkZ
Sadly no. At least, I don't know of any way to do that.