All info provided http://recess.wikia.com/wiki/Menlo
Menlo is Ms. Lemon's nerdy assistant, a very organized boy who wears a button-down shirt with a tie to school and spends most of his time inside the office, rarely going outside to recess as he's too busy. Before the current time line he was a rowdy boy, and T.J.'s best friend. It was hinted at that he once became "principal for a day" and the experience changed him to what he is now.
Menlo is friendly with Randall, though they don't do much together, and together they once took over the playground in episode "Partners in Crime." Randall was also at Menlo's birthday party.
Menlo is obsessed with living by rules. He lives by his planner, and disdains people who are disorganized, as seen in "Tucked in Mikey."
Although Menlo is sometimes an antagonist to the main characters, T.J. still attends Menlo's birthday party every year. TJ does this because Menlo felt sad at seeing their friendship die, so TJ promised he would go to his birthday party every year no matter what.
Menlo lives in a neighborhood of cookie-cutter houses, and held a cowboy-themed birthday party in his back yard.
He is voiced by Blake Ewing.