Your Constitution Score increases by 2 and your Dexterity or Wisdom +1.

Axolotl reach maturity at six months and live for an average of 15 years.

Axolotl tend to more chaotic alignments with no preference over good or evil however both sides of the spectrum can be found.

Axolotl are tiny creatures standing about 12 inches and can be slightly shorter or taller then this mark. Your size is Tiny.

Your base walking speed is 30ft.

You have a swim speed of 40 feet and can breath both air and water.

Axoltol’s can speak in the water in their native tongue known as Bubbles. They also can learn Common. You known Common and Bubbles.

You have disadvantage on attack rolls and Wisdom (Perception) checks that rely on sight when you, the target of the attack, or whatever you are trying to perceive is in direct sunlight.

Your face is simple and cute, making it difficult to instill fear in others. You have disadvantage on Charisma(Intimidate) checks.

You must keep your body and gills wet for your survival. If you fail to get yourself wet, through spells, swimming, or even submerging yourself in a puddle or bath after a period of 24 hours you gain a level of exhaustion each day until you die or get wet. These levels can only be fixed by drenching yourself in water.

Accustomed to dark caves from which you reside in, you have superior vision in dark and dim conditions. You can see in dim light within 120 feet of you as if it were bright light, and in darkness as if it were dim light. You can't discern color in darkness, only shades of gray.

Axolotl can heal themselves to an almost unnatural degree. Up to your proficiency bonus per short or long rest, you may burn a hit dice to heal yourself up to your hit dice roll plus your Constitution modifier.  

Additionally, your limbs do regrow after being lost, 1d4 days for fingers or toes, and 1d4 weeks for lost limbs or tails.