Choose +2 and +1 for two different ability score

Borrowers average less than 10 inches tall and weigh about a pound. Your size is tiny.

Your base walking speed is 20 feet. You have a climbing speed of 20 feet if the surface provides enough grip.

If a creature bigger than you shares their resources with you, you can bot eat and drink without needing to spend more than one ration.
Thanks to your size and lifestyle, you are proficient in Stealth.

Starting at level 5, if a spell targets at least 2 creatures, you can benefice from the effect of this spell as long as you are on one of the creatures the spell as being cast on. You and the caster must be willing. You can use this feature a number of times equal to your proficiency modifier per long rest.
For example: If you are on a creature teleported by dimension door, you don't count as a creature and can be teleported with them.
If invisibility is upcast and you are on one of the creatures targeted by the spell when the spell is cast, you are also invisible.

You have advantage on check to climb on creatures bigger than you. You can also use your dexterity instead of strength to do so.
While on an enemy, if an attack targeting you miss you, you can use your reaction to redirected to the creature you are on (keep the same attack roll). You can use this feature a number of times equal to your proficiency modifier per long rest.

You can move through the space of any creature that is of a size larger than yours and even ends up your turn in the space of another creature.
You can also pass through small space like a 2 inches wild gape.

You can speak, read, and write Common and one other language of your choice.