Oh yeah, I think I cracked it.
So not to be similair to Kanjuro's fruit, but also not to be like an hypothetical ink logia:
The user would be a paramecia type that produces a LIMITED ammount of ink and can either splash it wildly or use it sparely and delicately.
The user will have the property of a pen, allowing them to again soak up the ink and use it again, with the ability to eventually change the ink color, if desired.
Yup, this sounds like a fun fruit to me, not too OP.