Not my sister, not my tattoo, but I thought it was cool ;) From the original post on imgur:

Tui and La from Avatar The Last Airbender. My little sister is my favorite person, and ATLA is one of our many shared interests.

I have many tattoos, but I felt this was the best one to share for today!

PS: apparently it was National Tattoo Day on July 17th, hence the last sentence.