The starting aggressive item and Ink's SKILL are one and the same. Unlike the stick, it can't be used later to play fetch as that would hurt Ink as the handle is not made of Wood.
The colour of paint/ink dripping from the brush changes to match the associated SKILL of the equipped weapon. The handle does the same with the equipped armour, becoming translucent and glass-like with the Echo Chamber on.
Replaces the Stick.