This enemy appears in almost any level when the player takes too much time, normally when the player's timed score reaches 0. She is not a threat and is mostly just there to signify that you are taking too long, however she still does attack, dealing one damage per hit. In some levels, there are different conditions for how and when Ms. Sign spawns, and in an even smaller selection of levels, they indicate Assassin Bears that are about to be spawned:
Specifically in Chubby B. Goode, Ms. Sign spawns twice (first at 10 mins, second one at 14 mins, 26.67s), and after that the player will end up facing highly magnified Assassin Bears afterwards. This also happens in Murmuring Evil, but with half as much time for the Ms. Signs to spawn.
In Last Gang, Ms. Sign spawns earlier than usual (126.67 seconds), along with a large horde of Assassin Bears.
The Ms. Sign in Kugel Schreiber spawns as a boss after 233.33 seconds. Killing her will result in an Assassin Bear spawning.
Strangely, in Learned to Love, Ms. Signs are completely replaced by Assassin Bears.
In Gouache Ghouls, Ms. Sign spawns infinitely after 66.67 seconds, taking up the enemy limit. If the enemy base is damaged before that happens, extremely buffed Angels will appear and destroy the player's base.
You can use almost any unit to beat Ms. Sign, as her attack power is laughably low, and her health goes down very quickly, despite it being above most other Empire of Cats Enemies.
There is a "cheesing strategy" for many levels (notably Dark Souls and Deathhawk) with weak to mid-level peons involving Ms. Sign. Normally, it exploits her ten thousand knockbacks. If you wait for Ms. Signs to stack up until the enemy limit is reached (10 in the aforementioned stages), no other enemies will, including the boss. From there you can use Wall Cats to knock her back, and then summon your high-damage attackers. Note that this takes 75 minutes WITH a Speed Up, so it should only be used as a last resort.
A variant of Ms. Sign that appears in A Cultured Festival. Has less health, range and knockbacks, but slightly more speed and attack damage. Holds a sign depicting Doge, Snache and Teacher Bear, with the word "Welcome" in Teacher Bear's paws.
Her Japanese name has a double meaning: while Kanban Musume literally translates to "Signboard Girl", it can also refer to an attractive girl who stands outside a store to attract customers.
This may be why her description in the original Battle Cats said, "She is a slut."
Prior to version 1.5.2, the sign message changed depending on the device language (English or Japanese). However, after version 2.0.0, the original English version was lost. The English text used to be "Too late!! Come back stronger!!".