Well, my son is my (not so mini anymore) mini-me, only he has different coloring. He's a blue-eyed red-head and I'm a green-eyed blondish-brunette. We have the same face, I've been told so many times, and the same coloring- very, very almost albino skin coloring. He also has my personality, only so much more intense.
My stepdaughter is my Hubby's clone. Their baby/child pictures are only able to be told apart by the haircut and because my Hubby was a chubby child. They have the exact same personality, sometimes to an annoying degree.

My sister and my niece, well, I'm not sure they're not the same person. Everything, EVERYTHING about them is the same. Practically twins in the baby/child pictures, same temperment, personalities, etc. My niece is my sister all over again, only 22 years younger. If my sister wasn't alive, I'd completely believe it's reincarnation.