The alpacas are a race of animals inhabiting Hidden Kingdom. They make their home on Mt. Tima, the highest peak in Hidden Kingdom. They are somewhat affiliated with Big Green, and an alpaca is one of the heroes thereof.
It is unclear if the spiky secondary form taken by the alpacas was caused by Chaotic Energy or if it is a natural power of the alpacas. Although mutations are common under Chaotic Energy's influence, the alpaca that joined Big Green was seen in this form later on. Additionally, the alpacas left this state simply by being calmed, whereas mutations due to Chaotic Energy have typically required Harmonic Energy to cure.