Board Thread:General Discussion/@comment-26073173-20170526204239/@comment-27745396-20170607152302

Perhaps Roman hadn't semblance. If I remember correctly, WOR mentioned once that only person who has mastered their aura can use semblance. Roman probably had his aura activated but as Jaune proves, it might take a very long time before the person finds their semblance after that. And when it comes to Ren, his aura was probably activated at very young age or maybe it was just traumatic experiment that caused his semblance emerge early.