Another little tyke that leads to another easter egg involved in the DLC of "LEFT 4 DEAD",and which will help the players understand the storyline for Sonic Zombies...
The Violet teddy bear!

This little guy is strange-yet-harmless - somewhere in the other rounds after the Emerald and Topaz teddy bears appearing in several rounds : this little guy you would have to follow and will lead you to the control room,or the basement (which Robotnik's experimental lab),and once you find the little guy there,he will be standing infront of a "QUARANTINE" door,and will transport you to Eggman's secret library (which holds secrets to the Zombies' history and weaknesses)

And a perk he will reward you will be a "Protective Flak Jacket" perk - in which will divide the amount of damage the zombies will inflict on you...at least for 3 to 5 rounds

Enjoy :D