Ms. Caixeiro is the host of Battle of the Color Box. She is the first color block to appear since BotCB 0, ever since the intro. She is also the only block to have more than one color at one time. At the beginning of this series, she had a colorful rectangular outline from BotCB 0 to 2B. From BotCB 2C onwards, she has a 3-layer multicolor camouflage in order for her to look less drafty, and more complete. She will be given a name in BotCB 4B.
However, as fewer people do challenge (in 4B), she gets enraged and threatened the contestants that she will be replaced with a strict one. Her projected last appearance will be at 5B as less people do challenges.