I do not know if the sigils we have are related to our other forms specifically or if they are random or mean something completely unrelated. but yes we are, and sometimes it comes and goes.

I agree with the others though that you are probably fine if you simply do not attack first. if we ever meet nonviolent monsters we should not antagonize them either

and because you asked: I look like a human person only I have six tails, too. my name is Jack :) I fix people's clothes if they need it

[Yes that is a smiley face. Sorry, Sephiroth.]