Adam Lyon is a 12-year-old human boy who was transferred from Chester Arthur Middle School to Charles Darwin Middle School (CDMS) by an accidental misspelling of his last name from "Lyon" to "Lion".
As the series title suggests, in gym class, Adam was paired up with Jake Spidermonkey and the two are now best friends. Jake's plans have them getting involved in situations which end up with Adam in trouble. Adam, being physically weak, is often preyed upon by the other animal students.
Adam is voiced by Nika Futterman, who also voiced Luna Loud.