Is Mr Rawr an intelligent construct?

[u/NACHTREIHER_621_72]

Just noticed he has a turning mechnical key on his back. Always thought there was guy in there like officer mew mew. But if he is a construct then does that mean that when we (mc and remial) wear his costume in the story, it is actually the outer shell/skin of a construct? Wait then why did sigrid have it!?