Mouseling/Mouse-folk

ability score increase: +2 Dex +1 Con

age: Reach adulthood at 10 years and live at most to 50 years.

alignment: Mouselings tend to lean towards good alignments.

Size: Tiny

speed: 25 feet

Languages: Common, Squeak Speak

race features:
Keen Hearing and Smell. You have advantage on Wisdom (Perception) checks that rely on hearing or smell. Tiny Teamwork. You can use the Help action as a bonus action. When you do so your ally can add an extra 1d4 to the d20 roll. This can be done once per short or long rest. Tiny Weapons. Because of your size you need custom weaponry. You can use any weapon however the damage dice in one die smaller than normal. (Ex. Longsword is normally 1d8/1d10 so for a mouseling it would be 1d6/1d8) Sweet spot. When you make an attack roll against a target you can deal an extra 4d4 damage a number of times equal to your proficiency bonus per long rest. This damage increased to 6d4 at lvl 5, 8d4 at lvl 11 and 10d4 at lvl 17. Extreme Nimbleness. You can occupy the same space as any creature.