You a rat

The rat has advantage on Wisdom (Perception) checks that rely on smell.

With your tiny rat feet you may scale rough surfaces with ease!

Thanks to your tiny rat eyes, you have superior vision in dark and dim conditions. You can see in dim light within 60 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.

The rat blood that flows through your veins is unnaturally resilient. You are immune to disease but vulnerable to poison. Also you are a wonderful chef.

You can't use your rat face to formulate the languages of the bipedal big ones. Instead you can squeak and shit. Makes it so you can communicate with animals.