Leo

Leo was the one who created Mech-X4 some time prior to the events of Let's Call It Mech-X4!. He has warned that the Mech-X4 team monsters are coming and that Mech-X4 was built to defend the city. He knew that Ryan was a Technopath since birth, and that he'd be the one to discover Mech-X4. For Ryan's safety, he anonymously put him up for adoption. It's shown in Let's Get Some Air!, he is being held captive by the creator of the monsters, who is later found out to be Seth Harper. It is also revealed he built a failed prototype of MECH-X4 called MECH-X3, which was piloted by Leo OS and was scavenged for parts in the second half of season one.