When out his mech suit, Mechmo transforms into Elmo. Previously, Elmo held the title of King of Sesame Street. During one of his unconventional experiments, he inadvertently created a portal that transported him to a time and space unknown. This portal led him to Luma, where he has chosen to reside. It appears that the dimensional portals in Luma has blocked his return to his original dimension. Currently, Mechmo is dedicated to assisting Luma in improving their living conditions and simultaneously searching for a way back home. While doing so, he shares his superior intellect and wisdom with them.