I'll write more about this crap later but for now:
Ability Score Increase: Your Strength increases by +2.
Alignment: Chaos. It doesn't matter what the question is in certain circumstances, the answer'll always be the same. This is one of those times.
Size: Feegles are Tiny, and may only use weapons and armor and magic items usable at that scale. They can wear rings as necklaces and so on.
Quick Little Buggers: In a round in which the Feegle has taken the Dash action, they may Dash as a bonus action.
Not Bad, Just No Good: Feegle have trained in Animal Handling and Sleight of Hand.
Playin' Dirty: A Feegle can take an action to add their Proficiency Bonus to an ally, to be used on a check or attack roll.
Crivens: Feegle have proficiency with unarmed strikes, doing 1d4 damage on a hit.
Languages: Even when speaking Common, Feegles are sort of still speaking Feegle.
They also have a feat particular to them:
required: must be Feegle.
You may perform Rope Trick without material components, or even Rope! You have to take a short rest before you can do this again, or else that'd seem cowardly.