Paintbot
Paintbots are helpful little critters created by the INKT corporation. They debuted in the hit game De Blob, in the year de Blob came out.
The main purpose of a Paintbot is to store paint, as it's rather apt name implies. The paint it stores comes from the environment the original Leechbot was located in. After it is full of paint, it is usually rendered immobile due to how much paint is stored inside of it.
One might question INKT's motives for removing and storing all the color there is, but fret not, citizen! You can trust us that we'll be doing the right thing. After all, color is a crime, and INKT is the solution! That's what our CEO liked to say. Haven't seen him around often, though. He's probably doing important work that's none of my business.