Decepticon Ravage
Press and hold the Z button before selecting Cheetor and then press the A button. Then select the color of the character, to get secret character Ravage.
Tigatron
Press and hold the Z button before selecting Cheetor and then press the A button. Then select the color of the character, to get secret character Tigatron.
Decepticon Starscream
Press and hold the Z button before selecting Waspinator and then press the A button. Then select the color of the character, to get secret character Starscream.
Blackarachnia
Press and hold the Z button before selecting Tarantulas and then press the A button. Then select the color of the character, to get secret character Blackarachnia.