Chicken is a chicken CPU Mii. You can see Chicken here.
Wii Sports Edit
Chicken's level in Tennis is -502 and plays with Ika. His level in Baseball is only 2. His level in Boxing is -23.
Wii Sports Resort Edit
His level in Swordplay Duel and Speed Slice is -250. His level in Basketball is 56 and plays with Ika and Yaut. His level in Table Tennis is -283.