Capuchin Monkey

Pack Tactics. The monkey has advantage on an attack roll against a creature if at least one of the monkey's allies is within 5 feet of the creature and the ally isn't incapacitated.

Prehensile Tail. The monkey can grasp things with its tail. It has a reach of 5 feet, and it can lift a number of pounds equal to five times its Strength score. It can be used to do the following simple tasks: lift, drop, hold, push, or pull an object, or for the monkey to suspend itself.

Captive (Optional). If the monkey is a Familiar, Ranger's Companion, or otherwise captive it can be trained by someone with proficiency in Animal Handling. A trained monkey has +1 to Performance checks

Bite. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1 (1d4 − 1) piercing damage.