Yeah, most extra appendages or feature you have kind of remain more cosmetic. There might be some exceptions, but not all.

[Like his tail for instance swinging behind him, it could still grab things and hold onto other objects. Tilting his head when the light appears in Kars' palm, he nods. Even though the guy might want a second to process, Zidane talks anyway.]

Hey, at least you figured that out. Light magic, huh? I've only seen it used though so I can't much help in mastering it.