I tested it out against the whole cast and it works on everyone. (Well, not the full cast actually, I don't have Saiki or DLC chars but I suppose that they have the same hitboxes than Ash, Kyo, Takuma and Iori, but if someone can test on these so we are sure...)
Tests done midscreen and in the corner, using st. D, f. A, qcb + D, s. A, hcf + BD.