Laura Kinney, depending on the universe I guess, is Wolverine's clone. Wolverine was cloned in an attempt to duplicate the results of the Weapon X Project (because that's ever a good idea), but due to science fiction they couldn't make it work with a Y chromosome so boom, we get X-23, a female Wolverine.
I've never seen it play out, but I like to think that because they're genetic duplicates, Wolverine and X-23 have a hard time detecting each other with their superhuman senses... not that he'd need them to see the blue and gold clad woman clinging to the ceiling above his freaking dining room table. Open your damn eyes, Logan!
Also, here's the rough sketch for this one.