Diego is a high-tempered talking chihuahua, he is extremely proud of himself with a massive ego, his personality is almost identical to Puss in Boots while his voice is that of a middle-aged Mexican male, he usually speaks faster when he is emotional or anxious while also having the tendency to speak more and more Spanish when upset, mixing it into his conversations, while it is not required we would prefer for the voice actor to know a little Spanish or be willing to pronounce some mixed in with the dialogue. 

This is a very prominent side character, would preferably have a medium to high voice for this role.