LOCK, the Monsuno left to Chase by his missing father. Physically strong and potentially destructive, Lock is a wise creature who has experienced earth since the beginning of humanity. Slow to anger but fiercely protective of Chase, Lock sees great potential in the Suno family, and sticks with the boy because of the incredible potential he represents.
Theoretically, Lock could see humanity as a threat and destroy them. But, could he do such a thing? Would he? Lock and Chase are true partners. They have the same goals; (1) Save the Monsuno from humanity, (2) Use the Monsuno to save humanity, and the world by extension, (3) Learn to coexist.