Halfling (5e Subrace)
From D&D Wiki
This Subrace allows the crossbreeding of races without the use of dedicated halfbreed races. A half-halfling person is the child of a halfling father, born to a mother from another race. Half-halflings tend to come across as almost perfectly normal, if a little bit odd.
Ability Score Increase. Your Dexterity, Constitution or Wisdom score increases by 1.
Brave. You have advantage on saving throws against being frightened.
Lucky. When you roll a 1 on a d20 roll, you can reroll it and must take the new roll. You can use this ability once per short or long rest.