I can say that I think it's fine to have interest in Bionicle at any age, but I think it's very unsafe to play rated M games underaged. (I don't think you're underaged, but I seriously question why your parents would encourage you to be exposed to content like that, even at the appropriate age.)
My parents are fine with Bionicle for the most part. My dad isn't around too often, so I don't know his thoughts, but he's seen some of my MOCs, and he thinks they're cool. My mom very supportive of it. She will come with me to Bricks and Minifigs and listens to what I have say if I mention it, like yesterday. She is also supportive of any MOC I show her.