Monkeys deal well in all sorts of tree-filled or vertically challenging terrain. You gain proficiency in acrobatics or athletics. And a climbing speed of 30 feet

As a monkey beastfolk, you have a +2 to dex.

Monkey beast folk age the same as humans so you will reach adulthood in their late teens and live less than a century.

Monkey Beastmen lean towards a wide variety of alignments, many being chaotic.

Monkeys vary widely in height and build, from barely 3 feet to well over 4 feet tall. Regardless of your position in that range, your size is small

You can speak, read, and write Common and one extra language of your choice. Beastfolk typically learn the languages of other peoples they deal with, including obscure dialects. They are fond of sprinkling their speech with words borrowed from other tongues: Orc curses, Elvish musical expressions, Dwarvish military phrases, and so on.

Monkey Beastmen have an inherent charisma about them, this could be great smooth-talking, a cute demeanor, a chaotic allurement, or whatever fits your character best. You have +1 to charisma checks.