Now this makes me wonder what a Gibberling PC would be like.
Their short, pale, grayish skin is covered in a thick, coarse black fur. Their fur is knotted, greasy, clumped with dirt, and filled with bugs. Their skin is rife with callouses, scrapes, blisters, bumps, and oozy, pussy (as in puss) lumps.
A Gibberlings eyes are extremely sensitive to light. They shy away from even it's most meager presence. They prefer the isolation of total dark, or in some cases, to travel the surface during the night time.
Gibberlings are a mad, raving bunch. Making clicks, hoots, howls, and what sounds like laughing. They usually travel in packs of 8 or more, and are rarely ever alone. They scavenge whatever they can find, usually a large rock, some bones, or even discarded treasure.
Age – Gibberlings are weird creatures, and not much is known about them.
Size – Between 3-4 feet tall, and weighing 50-80 lbs. Your size is small.
Speed – 30 feet
Language – Inane Muttering, if you know another language or languages, you can understand the other spoken language, but you can only speak it in broken pieces, which requires twice the amount of time to speak it. You also don't have the coordination or patience to write any of the language out aside from crude cave drawings.
Ability Score Increase – +2 Dexterity
Darkvision – You have a darkvision of 120 feet, but you also suffer Light Sensitivity in the presence of bright light. While in the presence of bright light you suffer Disadvantage to all of your rolls.
Mania - You are filled with an overwhelming excitement and blood lust. You just want to touch, see, and experience everything. But, at the same time you also want to taste everything, usually teeth first. You make all Wisdom saves at Disadvantage. If you haven't bitten a living creature and tasted it's blood, felt it squirm in your mouth, heard it scream, etc... in at least the past 24 hours, you must make a Wisdom save vs a DC of 10, on a failed save attack the nearest living creature (except for another Gibberling). For every 24 hours you go without fulfilling this crazy blood lust, the DC to resist increases by 5. It resets once you bite an unsuspecting victim.
Landmass Traverser - You have proficiency in the Athletics and Acrobatics skills. Anytime you make a skill check using either Athletics or Acrobatics to climb or squeeze through a tight space you have Advantage on the ability check.
Infested - You are infested with mites or fleas. These do not bother you, and you are quite use to them. Due to your intense infestation you can ward off a day's worth of hunger by eating your own infestation. You must wait a week before you can do so again. You also infest an area with your bugs once you have spent an hour or more there. Infested creatures other than yourself suffer Disadvantage on attack rolls.
Infected - You are infected with weird diseases and infections. You give off a noxious smell in a 30' radius. Creatures must pass a Constitution save DC 10 or be distracted by the smell, losing their Reaction. A creature that fails it's save can repeat it at the end of each of it's turns. On a successful save a creature can not be effected by the noxious smell of a Gibberling for 24 hours. You also have Advantage on Constitution saves vs Disease.
Not bad for a 5-10 minute thought.