Lan

Lan's actual name is simply C - it's Gingetsu who decides to name him Lan (Ran). He was called C because he was one of the three-leaf clovers that once existed, and those triplets' names were A, B and C. Now he's the only one living left, and as he's living away from the Clover Project research facility, he's aging quickly (that's why we can see Ran as a child in the last volume flashback, and as a boy in his late teens or even early twenties in the other volumes, even when two years have passed only since he met G…