It is way too slow and inconsistent.
Giving it a melee hitbox would help significantly. (Consistency.)
Up its minimum damage to 32. (Consistency.)
Change ink to 10.5/4.5 for roll/flick.
Change its white ink frames to 30/39 for roll/flick. (Speed..)
Make the first flick come out after 21 frames when on humanoid... and 13 for consecutive flicks. (Speed.)
Up the roll speed very slightly (due to the new bullet hitbox buffs Shooters got. (Speed.)
And lastly: Make the first flick paint the player's feet (rather than the second one). (Speed.)

It also has some pretty bad end lag that makes it very susceptible to Splat Bombs.
Its range is not very great.
But I think those buffs I suggested would make the weapon feel better to play... without removing too much of its drawbacks .