Penance got a tattoo on her left arm which is the Ouroboros symbol.

This question gave me the knee-jerk thought of Blue having a lower back tattoo that NO ONE would know about and that IS very funny to me

Neither of them have one but they're certainly stupid enough to do that

I think Venetia might of considered getting a tattoo in the period between her father’s death and her leaving Higashi to find Kal’tsit and fight for her, but ultimately decided against it. She likes the higashi style of tattoos though!

Honestly haven't gotten deep enough into some of my oc building to consider something like this but I do like this idea and will use it in the future