Question: gizmo is not a gremlin?
Answer: First of all, Gizmo is a mogwai, not a gremlin. Gremlins are mogwai who eat after midnight. Now, it is a fact that Gizmo seemed to be a good, sweet mogwai and the others, particularly Stripe, were more mischievous and deceitful, and perhaps actively sought to turn into gremlins.